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Fix try-except for seaborn kdeplot by specifying exception

Simon Maenaut requested to merge Fix-try-except-for-seaborn into master

So apparently except(): introduced in 8d4f8381 doesn't catch the exception raised (see below) and either the exception has to be specified (as I have done here) or all exceptions have to be caught with except Exception as e: or something similar.

Error log 
Traceback (most recent call last):
  File ".../pyring/bin/pyRing", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File ".../pyRing/pyRing.py", line 2361, in main
    try:                          plots.Mf_af_plot(x, Mf_dist, af_dist, **input_par)
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../pyRing/plots.py", line 1872, in Mf_af_plot
    sns.kdeplot(              ringdown_df['Mf'], ringdown_df['af'], ax=bottom_left_ax, color=colors[0], shade=True)
TypeError: kdeplot() takes from 0 to 1 positional arguments but 2 positional arguments (and 2 keyword-only arguments) were given

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