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in build.py self.do_compile (line 274) not returning valid JSON

See original GitHub issue

Problem statement

As of last night, build.py began failing with the following error:

Exception in thread Thread-2: Traceback (most recent call last): File “/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py”, line 801, in __bootstrap_inner self.run() File “build.py”, line 176, in run self.gen_core() File “build.py”, line 209, in gen_core self.do_compile(params, target_filename, filenames, “”) File “build.py”, line 274, in do_compile json_data = json.loads(json_str) File “/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/init.py”, line 339, in loads return _default_decoder.decode(s) File “/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py”, line 364, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File “/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py”, line 382, in raw_decode raise ValueError(“No JSON object could be decoded”) ValueError: No JSON object could be decoded

[X ] Bug report
Feature request

What were you trying to do when you hit this bug? Or, what do you want to do with Blockly that your proposed feature would enable?

Trying to compile into compressed files by running build.py

Please describe what should happen. Include screenshots if applicable.

build.py should complete with no errors.

Describe what actually happens. Include screenshots if applicable.

When I run sudo python build.py many modules compile. Right after /msg/js/zh-hant.js, I get the error pasted above.

Explain what someone needs to do in order to see what’s described in Actual behavior above

Stack Traces

Please open up the console.  If you see any Blockly-related errors, paste them here.
See above.

Operating System and Browser

-[x] Terminal window OS X

Desktop:
- Chrome
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- IE 10+
- IE 11
- EDGE
Smartphone/Tablet/Chromebook (please complete the following information):
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]