adding exception check for test server

pykat/testing/test.py

@@ -363,6 +363,7 @@ class FinesseTestProcess(Thread):
                 self.cancelCheck()
                 self.running_kat = out
                 
+                try:        
                     ref_file = os.path.join(REF_DIR,out)
                     out_file = os.path.join(SUITE_PATH,out)
                 
@@ -412,6 +413,9 @@ class FinesseTestProcess(Thread):
                     print "removing out file ", out_file
                     os.remove(out_file)
                     
+                except DiffException as ex:
+                    print(str(ex), "output =", out)
+                    
                 self.done_kats.value += 1
         
         print "Finished diffing..."