Fix #1178: Ignore PDB load errors.

ILSpy/LoadedAssembly.cs

@@ -168,6 +168,7 @@ namespace ICSharpCode.ILSpy
 		
 		private void LoadSymbols(PEFile module)
 		{
+			try {
 				var reader = module.Reader;
 				// try to open portable pdb file/embedded pdb info:
 				if (reader.TryOpenAssociatedPortablePdb(fileName, OpenStream, out var provider, out var pdbFileName)) {
@@ -183,6 +184,9 @@ namespace ICSharpCode.ILSpy
 
 					// TODO: use symbol cache, get symbols from microsoft
 				}
+			} catch (BadImageFormatException) {
+				// Ignore PDB load errors
+			}
 
 			Stream OpenStream(string fileName)
 			{