too many statements in try-except clause for loading existing .dat file

[stefanpauliuk]

There are 40 lines of code in the following try-except clause:
try: # Load Pickle parameter dict to save processing time
That means any error within these many commands will give no error message and the same result: The .dat file is not read and all parameter files are re-read.
Consider a introducing a leaner exception handling here, or add more error messages at least!
Not sure whether it's good style to have nexted try-except clauses...

[CarrerF]

By replacing try-except with

if ParFileName in os.listdir(RECC_Paths.data_path):
..
else:
..

it should give an error message pointing at the line in which it's happening, rather then the general try-except error message.

[chauenstein]

Thanks @stefanpauliuk for pointing this out and @CarrerF for the helpful suggestion! Now implemented in PR #82