[SIGMON-145] do not crash

Context

• task:https://its.cern.ch/jira/browse/SIGMON-145
• lhc-sm-api MR: lhc-sm-api!96 (merged)
• lhc-sm-hwc MR: lhc-sm-hwc!47 (merged)

What was done

• 'safe' version for pandas.at written

TODO

• ?

QA

• no sonar yet (config needs to be pushed to master first)
• code was unit tested
• acceptance tests were not written, because there were no new features

Review objectives

• assessment of code functionality
• assessment of code quality
• identifying potential refactorings / logic common to other projects
• knowledge sharing

mentioned in merge request lhc-sm-api!96 (merged)

mentioned in merge request lhc-sm-hwc!47 (merged)

changed the description

requested review from @emthalle and @garnierj

approved this merge request

resolved all threads

added 1 commit

• d94baa77 - pydoc shortened

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approved this merge request

marked this merge request as ready

approved this merge request

mentioned in commit d382f41f

merged