fix build and project options panel.

src/AddIns/Analysis/SourceAnalysis/SharpDevelop.SourceAnalysis.targets

@@ -1,6 +1,7 @@
 <?xml version="1.0"?>
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-	<UsingTask TaskName="StyleCopTask"
+	<UsingTask Condition="'$(StyleCopFile)' != ''"
+	           TaskName="StyleCopTask"
 	           AssemblyFile="$(StyleCopFile)"/>
 	
 	<PropertyGroup>

src/AddIns/Analysis/SourceAnalysis/Src/AnalysisProjectOptionsPanel.cs

@@ -63,7 +63,7 @@ namespace MattEverson.SourceAnalysis {
 			string styleCopPath = StyleCopWrapper.FindStyleCopPath();
 			string executable;
 			if (styleCopPath != null)
-				executable = Path.Combine(styleCopPath, "StyleCopSettingsEditor.exe");
+				executable = Path.Combine(Path.GetDirectoryName(styleCopPath), "StyleCopSettingsEditor.exe");
 			else
 				executable = null;
 			string parameters = "\"" + settingsFile + "\"";