feat: add fail-safe when providing empty table type

[Alkaar]

Added a fail-safe so that providing an empty string table type is the same as not providing a table type at all. People have mistaken passing an empty string table type as not specifying a table type at all. This makes it such that the bot behaves the same way, preventing user error.

• [x] Empty string table type is the same as no table type
• [x] Added respective unit test

[codecov-commenter]

Codecov Report

Base: 58.62% // Head: 58.62% // No change to project coverage :thumbsup:

Coverage data is based on head (8a5571f) compared to base (a47c4f0). Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #86 +/- ## ======================================= Coverage 58.62% 58.62% ======================================= Files 5 5 Lines 116 116 Branches 2 4 +2 ======================================= Hits 68 68 Misses 48 48 ``` | [Impacted Files](https://codecov.io/gh/Alkaar/resy-booking-bot/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Derek+Fong) | Coverage Δ | | |---|---|---| | [src/main/scala/com/resy/ResyClient.scala](https://codecov.io/gh/Alkaar/resy-booking-bot/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Derek+Fong#diff-c3JjL21haW4vc2NhbGEvY29tL3Jlc3kvUmVzeUNsaWVudC5zY2FsYQ==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Derek+Fong). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Derek+Fong)

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[github-actions[bot]]

:rocket: PR was released in v3.1.0 :rocket: