When parsing results from a .csv file skip over any results that are invalid

[peterjamesnugent]

Description:

Results cannot be read when invalid or empty results are present:

Steps to reproduce:

1. Push model with loads and Loadcases that can be solved
2. Create empty Loadcase with no loads applied
3. Attempt to pPull NodeReaction

Expected behaviour:

Allow user to pull NodeReaction despite empty Loadcase

Test file(s):