Cannot init blockfrost chain context

[thaopt]

fixed: #353

This one should be str as defined in the function description.
i cannot initialize the blockfrost chain context due to the recent change:

base_url: Optional[str] = None
...
self._base_url = (base_url) ==> base_url
....
if "mainnet" in self._base_url.value:
self._network = Network.MAINNET

self._base_url is str then cannot have attr value (maybe enum item i think) so cannot init the context properly

[thaopt]

I am not sure if have any testcase for this recent change?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (7fbbe68) to head (f5f9239).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #358      +/-   ##
==========================================
+ Coverage   83.68%   83.98%   +0.29%     
==========================================
  Files          29       29              
  Lines        3733     3733              
  Branches      941      941              
==========================================
+ Hits         3124     3135      +11     
+ Misses        445      433      -12     
- Partials      164      165       +1     

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[cffls]

Thanks for fixing this! I will add some tests to it.