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Add handlesnull parameter to @qgsfunction
Up to date it was not possible to create a function that handles NULL values with the @qgsfunction decorator. As soon as any parameter was NULL, the return value would also be NULL. Example of a function that returns a value now with a NULL paramter and would have returned NULL before ``` @qgsfunction(args=-1, group='Custom', handlesnull=True) def mean_value(vals, feature, parent): valid_vals = [val for val in vals if val != NULL] return sum(valid_vals)/len(valid_vals) ``` [FEATURE]
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