Fix Unit Test Python script error if a file is missing

Scripts/UnitTesting/RunUnitTests.py

@@ -74,21 +74,25 @@
 
 def compareResults( oldFolder, newFolder ):
 	global g_hasDifferentFiles
-	cmpResult = filecmp.dircmp( oldFolder, newFolder )
-	if len( cmpResult.left_only ) > 0:
+	try:
+		cmpResult = filecmp.dircmp( oldFolder, newFolder )
+		if len( cmpResult.left_only ) > 0:
+			g_hasDifferentFiles = True
+			print( 'WARNING: these files were not generated by this unit test but should have been:' )
+			print( str( cmpResult.left_only ) )
+		if len( cmpResult.right_only ) > 0:
+			g_hasDifferentFiles = True
+			print( 'WARNING: these files were not in the original cmp folder:' )
+			print( str( cmpResult.right_only ) )
+
+		if len( cmpResult.diff_files ) == 0:
+			print( 'All files equal' )
+		else:
+			g_hasDifferentFiles = True
+			print( 'ERROR: Different files: ' + str( cmpResult.diff_files ) )
+	except FileNotFoundError as err:
 		g_hasDifferentFiles = True
-		print( 'WARNING: these files were not generated by this unit test but should have been:' )
-		print( str( cmpResult.left_only ) )
-	if len( cmpResult.right_only ) > 0:
-		g_hasDifferentFiles = True
-		print( 'WARNING: these files were not in the original cmp folder:' )
-		print( str( cmpResult.right_only ) )
-
-	if len( cmpResult.diff_files ) == 0:
-		print( 'All files equal' )
-	else:
-		g_hasDifferentFiles = True
-		print( 'ERROR: Different files: ' + str( cmpResult.diff_files ) )
+		print( 'ERROR: {0}'.format( err ) )
 
 def runUnitTest( exeName, jsonName ):
 	exeFullpath = os.path.abspath( os.path.join( g_exeFolder, exeName ) )
@@ -126,4 +130,4 @@ def runUnitTest( exeName, jsonName ):
 	else:
 		print( 'All files in all tests were equal' )
 else:
-	print( 'No comparison was made as the script was run in generation mode' )
+	print( 'No comparison was made as the script was run in generation mode' )