split_df_col2cols function errors on too few columns

[stevekm]

In the script merge_vcf_annotations.py, function split_df_col2cols gives an error if the number of fields output by merge_df['AAChange'].str.split(':') is fewer than the number of replacement columns (5 given by default).

[stevekm]

In at least one case, a sample variant with no coding change somehow passed this step and generated a summary table, while the variant itself still lacked the Amino Acid change field in the annotation (e.g. p.R123H item). Need to investigate why the lack of this field results in errors for some cases but not others.

[stevekm]

This error also occurs if an intronic variant gets through filtering criteria and is processed by the function