Fix broken pandas based tests

[supriyagarg]

No description provided.

[supriyagarg]

@jonparrott Looks like the 2 lines not covered are the ones that check if pandas exists, and sets it to None otherwise: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/monitoring-autogen/monitoring/google/cloud/monitoring_v3/_dataframe.py#L21

What is a reasonable way to test this?

[tseaver]

@supriyagarg you can just add #pragma: NO COVER to the except ImportError: line.

Also, the lint failures are:

google/cloud/monitoring_v3/__init__.py:22:80: E501 line too long (80 > 79 characters)
google/cloud/monitoring_v3/__init__.py:44:80: E501 line too long (90 > 79 characters)

[supriyagarg]

@tseaver: thanks for your comments!
Fixed the coverage and lint errors.

[theacodes]

Thank you, @supriyagarg.