[BugFix] Handle Options Skew Error From Zero/Empty IV Value

[deeleeramone]

1. Why?:

   • This handles a KeyError from OptionsChainsProperties when skew cannot be calculated from a given expiry.
     • Error will mostly be contained to VIX and similar chains, or when new weekly expiries are opened and IV is reported as 0, resulting in an unexpectedly empty DataFrame.

2. What?:

   • Adds checks before accessing the potentially empty DFs and raises an error accordingly.

3. Impact:

   • Improved error handling.

4. Testing Done:

   • Kind of hard to recreate, you might need to use VIX from Cboe, after hours, or when a new expiry is opened.

Before:

After: