gives all kinds of json debug output that is not requested

[ghost]

folkert@msi:~/Projects/git/covpare$ python compare.py bla1 bla2 --line-diff | less
...
t1/allocator.h:280 | 0 0 | _GLIBCXX_END_NAMESPACE_VERSION
t1/allocator.h:281 | 0 0 | } // namespace std
t1/allocator.h:282 | 0 0 |
t1/allocator.h:283 | 0 0 | #endif
{u'_id': ObjectId('5e3056fcca62807fff6fe1e8'),
u'blocks': 100,
u'calls': 374,
u'filename': u't1/basic_string.h',
u'lines': [{u'blocks': [],
u'branches': [],
u'hits': 1.0,
u'lineno': 156,
...