Fix padding_width = 0

[hugovk]

Based on kxxoling/PTable#2 from the PTable fork.

Thanks to @Sebelino for the original PR:

Fixes a bug where setting padding_width to 0 has the same effect as setting it to 1. This makes it possible to create compact tables like these:

+-+-+-+
|a|b|c|
|d|e|f|
|g|.|.|
+-+-+-+

abc
def
g..

[codecov]

Codecov Report

Merging #80 (c0896b1) into master (f9913bb) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   87.31%   87.53%   +0.21%     
==========================================
  Files           3        3              
  Lines        1498     1516      +18     
==========================================
+ Hits         1308     1327      +19     
+ Misses        190      189       -1     

Flag	Coverage Δ
GHA_Ubuntu	87.53% <100.00%> (+0.21%)	⬆️
GHA_Windows	87.53% <100.00%> (+0.21%)	⬆️
GHA_macOS	87.53% <100.00%> (+0.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/prettytable/prettytable.py	82.38% <100.00%> (+0.12%)	⬆️
tests/test_prettytable.py	100.00% <100.00%> (ø)

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