Case-insensitive option can cause charts to fail

[David Platten]

If a user selects the case-insensitive chart category option and the chart categories include a blank (NoneType) then the charts fail. This is because lambda function on line 180 of chart_functions.py cannot tolerate a NoneType value due to the use of .lower().

return_structure['summary'][index] = sorted(return_structure['summary'][index], key=lambda k: k['db_series_names_to_use'].lower())

[David Platten]

Fixed bug that caused charts to fail if case-insensitive categories was on and one of the categories was NoneType. References issue #757.

→ <<cset 5e0c1dd34de0>>

[David Platten]

This issue was fixed in commit #758bd45 as part of issue #759 and has been merged into develop.

[David Platten]

This issue was fixed in commit #758bd45 as part of issue #759 and has been merged into develop.

[Ed McDonagh]

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