Log parser error due to zero power measurements

[raghavian]

Sometimes the power_usage entries and duration arrays do not match in size causing an error in parsing at this line . Asserting for size should be introduced. Currently throws the following error.

File "/home/image/miniconda3/lib/python3.8/site-packages/carbontracker/parser.py", line 25, in parse_all_logs
    "components": parse_logs(log_dir, std, out),
  File "/home/image/miniconda3/lib/python3.8/site-packages/carbontracker/parser.py", line 54, in parse_logs
    energy_usages = (power_usages.T * durations).T
ValueError: operands could not be broadcast together with shapes (1,11) (10,)
'''