Remove unnecessary newlines in run cell

[talkaminker]

When running a cell, the cell that is actually ran in the ipython contains 2 redundant newlines in the end.
this is inconvenient because it reduces the amount of text you see in ipython console.
here is a fix:
in: spyder/widgets/sourcecode/base.py in the function get_cell_as_executable_code
instead of
return text
write:
return text.rstrip()

This will also remove endlines added by the user which I think is actually a desired behavior anyway (for example, I tend to add newlines just to visually separate between one cell and the next one)

If you think this is good, I can create a pull request with the fix.

Note: right now, the newlines which are in the beginning of the cell are stripped anyway, so removing the trailing newlines just seems natural.

[ccordoba12]

I think at least one new line is needed to get the console to evaluate the cell.

But if you make that work, please send us a pull request :-)

[talkaminker]

I tested it before opening the issue, it works. I added a pull request
I added the pull req to master but I don't know how you guys work, so please move it if it is wrong

[goanpeca]

@ccordoba12 this should beagainst what branch ?

[ccordoba12]

It's a very simple change, so I'd say 3.1.x.

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