dqsegdbCheckVersion is broken

The dqsegdb.apicalls.dqsegdbCheckVersion function is broken:

$ python -c "from dqsegdb import apicalls; print(apicalls.dqsegdbCheckVersion('https', 'segments.ligo.org', 'H1', 'DMT-ANALYSIS_READY', '1'))"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/duncan/git/dqsegdb/dqsegdb/apicalls.py", line 80, in dqsegdbCheckVersion
    version_list=result_json['version']
NameError: name 'result_json' is not defined