Merge "logging: set stdout and stderr to None in some cases"

tools/releasetools/common.py

@@ -251,6 +251,8 @@ def RunAndCheckOutput(args, verbose=None, **kwargs):
   """
   proc = Run(args, verbose=verbose, **kwargs)
   output, _ = proc.communicate()
+  if output is None:
+    output = ""
   # Don't log any if caller explicitly says so.
   if verbose != False:
     logger.info("%s", output.rstrip())