TT#76552 bin/check.py: fix error when loading JSON file
> Traceback (most recent call last):
> File "/usr/share/kamailio-config-tests/./bin/check.py", line 341, in
> main
> check = load_json(args.kam_file)
> File "/usr/share/kamailio-config-tests/./bin/check.py", line 327, in
> load_json
> output = json.load(file)
> File "/usr/lib/python3.9/json/__init__.py", line 293, in load
> return loads(fp.read(),
> File "/usr/lib/python3.9/json/__init__.py", line 346, in loads
> return _default_decoder.decode(s)
> File "/usr/lib/python3.9/json/decoder.py", line 337, in decode
> obj, end = self.raw_decode(s, idx=_w(s, 0).end())
> File "/usr/lib/python3.9/json/decoder.py", line 355, in raw_decode
> raise JSONDecodeError("Expecting value", s, err.value) from None
> json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
>
> During handling of the above exception, another exception occurred:
>
> Traceback (most recent call last):
> File "/usr/share/kamailio-config-tests/./bin/check.py", line 365, in
> <module>
> main(args)
> File "/usr/share/kamailio-config-tests/./bin/check.py", line 344, in
> main
> test.error("Error loading file:%s" % args[1])
Change-Id: I1e568b6ec715ae53979fc25473e66ed5ccb70907