Skip cell comment

[pshriwise]

Ran into a case where a line containing only a comment character, 'c' is treated as a cell.

This happens with a section in the cell cards that looks something like.

...
 4980  131 0.06026342    8085  -8086   8654  -4684  27  100 -200 imp:n=1 
 4985  133 0.06000038     8011  -8086   4684  -4682  27  100 -200 imp:n=1
 4995  130 0.099591    8011  -8086   4682  -53    27  100 -200 imp:n=1
c
c      Comment line sandwiched by two blank comment lines
c
 5001  130 0.099591    7511  -7586   -67 7602  -53  100 -200 imp:n=1
 5002  133 0.06000038    7511  -7586   -7602  7604  -53  100 -200 imp:n=1 
...

Sorry for all the whitespace changes. The only actual change I made is at line 799.

This seemed to do the trick for me

[shimwell]

Sorry for the delay I just noticed this PR while doing some spring cleaning, I shall make a test to check this behavior then I think we can merge it.

[shimwell]

I can't quite reproduce the error you were getting, I wrote a test for the example problem but I guess it is not reproducing your situation correctly #49