remove else clause to use default error messages

Author: tushar5526

p5/visualTests/sanity_testing.py

@@ -33,7 +33,3 @@
         process = run(['python', name], stderr=PIPE, encoding='utf-8', timeout=2)
     except subprocess.TimeoutExpired:
         pass
-    else:
-        # If any error was found raise and exception
-        if process.stderr:
-            raise Exception(f'{process.stderr} in {name}')