Show package not found error message for Update-Package -reinstall

Fixed null reference exception when package not found when
reinstalling a package for a single project.

Throw an exception when the package id cannot be found when
reinstalling a package for a single project or if the package id
cannot be found in any project when reinstalling for all projects.

src/AddIns/Misc/PackageManagement/Cmdlets/Project/Src/UpdatePackageCmdlet.cs

@@ -228,10 +228,26 @@ namespace ICSharpCode.PackageManagement.Cmdlets
 		void ReinstallPackageInSingleProject()
 		{
 			IPackageManagementProject project = GetProject();
-			IPackage package = project.FindPackage(Id, null);
+			IPackage package = FindPackageOrThrow(project);
 			ReinstallPackageInProject(project, package);
 		}
 		
+		IPackage FindPackageOrThrow(IPackageManagementProject project)
+		{
+			IPackage package = project.FindPackage(Id, null);
+			if (package != null) {
+				return package;
+			}
+			
+			throw CreatePackageNotFoundException(Id);
+		}
+		
+		static InvalidOperationException CreatePackageNotFoundException(string packageId)
+		{
+			string message = String.Format("Unable to find package '{0}'.", packageId);
+			throw new InvalidOperationException(message);
+		}
+		
 		void ReinstallPackageInProject(IPackageManagementProject project, IPackage package)
 		{
 			ReinstallPackageAction action = CreateReinstallPackageAction(project, package);
@@ -269,13 +285,20 @@ namespace ICSharpCode.PackageManagement.Cmdlets
 		
 		void ReinstallPackageInAllProjects()
 		{
+			bool foundPackage = false;
+			
 			IPackageRepository repository = GetActivePackageRepository();
 			foreach (IPackageManagementProject project in ConsoleHost.Solution.GetProjects(repository)) {
 				IPackage package = project.FindPackage(Id, null);
 				if (package != null) {
+					foundPackage = true;
 					ReinstallPackageInProject(project, package);
 				}
 			}
+			
+			if (!foundPackage) {
+				throw CreatePackageNotFoundException(Id);
+			}
 		}
 	}
 }

src/AddIns/Misc/PackageManagement/Cmdlets/Test/Src/UpdatePackageCmdletTests.cs

@@ -888,6 +888,20 @@ namespace PackageManagement.Cmdlets.Tests
 			Assert.IsTrue(ReinstallPackageInSingleProjectAction.UpdateDependencies);
 		}
 		
+		[Test]
+		public void ProcessRecord_ReinstallPackageIdIntoProjectWhenPackageIdNotFound_ExceptionThrownAboutMissingPackage()
+		{
+			CreateCmdletWithActivePackageSourceAndProject();
+			SetIdParameter("UnknownPackageId");
+			SetProjectNameParameter("MyProject");
+			cmdlet.Reinstall = true; 
+			FakePackage testPackage = fakeProject.FakeLocalRepository.AddFakePackageWithVersion("Test", "1.2.3");
+			
+			var ex = Assert.Throws<InvalidOperationException>(RunCmdlet);
+			
+			Assert.AreEqual("Unable to find package 'UnknownPackageId'.", ex.Message);
+		}
+		
 		[Test]
 		public void ProcessRecord_ReinstallWhenPackageIdAndProjectNameSpecifiedAndSourceRepositoryIsOperationAware_ReinstallOperationStartedAndDisposedForPackage()
 		{
@@ -1064,5 +1078,22 @@ namespace PackageManagement.Cmdlets.Tests
 			operationAwareRepository1.OperationsStarted.Single().AssertOperationWasStartedAndDisposed(RepositoryOperationNames.Reinstall, "B");
 			operationAwareRepository2.OperationsStarted.Single().AssertOperationWasStartedAndDisposed(RepositoryOperationNames.Reinstall, "B");
 		}
+		
+		[Test]
+		public void ProcessRecord_ReinstallPackageInAllProjectsButPackageNotFound_ExceptionThrown()
+		{
+			CreateCmdletWithActivePackageSourceAndProject();
+			AddPackageSourceToConsoleHost();
+			SetSourceParameter("Test");
+			SetIdParameter("UnknownPackageId");
+			cmdlet.Reinstall = true;
+			FakePackageManagementProject project1 = fakeSolution.AddFakeProject("Project1");
+			FakePackageManagementProject project2 = fakeSolution.AddFakeProject("Project2");
+			FakePackageManagementProject project3 = fakeSolution.AddFakeProject("Project3");
+			
+			var ex = Assert.Throws<InvalidOperationException>(RunCmdlet);
+			
+			Assert.AreEqual("Unable to find package 'UnknownPackageId'.", ex.Message);
+		}
 	}
 }

src/AddIns/Misc/PackageManagement/Project/Src/PackageManagementProject.cs

@@ -221,12 +221,6 @@ namespace ICSharpCode.PackageManagement
 			string message = String.Format("Multiple versions of '{0}' found. Please specify the version.", packageId);
 			return new InvalidOperationException(message);
 		}
-
-		InvalidOperationException CreatePackageNotFoundException(string packageId)
-		{
-			string message = String.Format("Unable to find package '{0}'.", packageId);
-			return new InvalidOperationException(message);
-		}
 		
 		public ReinstallPackageAction CreateReinstallPackageAction()
 		{