check if incorrect dimensions and pad numbers if missing

[zktuong]

fixes #51

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e9cdc8b) 97.23% compared to head (710dbc5) 97.27%. Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #57 +/- ## ========================================== + Coverage 97.23% 97.27% +0.03% ========================================== Files 7 7 Lines 652 660 +8 ========================================== + Hits 634 642 +8 Misses 18 18 ``` | [Flag](https://app.codecov.io/gh/zktuong/ktplotspy/pull/57/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/zktuong/ktplotspy/pull/57/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | `97.27% <100.00%> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/zktuong/ktplotspy/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong) | Coverage Δ | | |---|---|---| | [ktplotspy/plot/plot\_cpdb.py](https://app.codecov.io/gh/zktuong/ktplotspy/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zewen+Kelvin+Tuong#diff-a3RwbG90c3B5L3Bsb3QvcGxvdF9jcGRiLnB5) | `94.30% <100.00%> (+0.19%)` | :arrow_up: |