Fixups learned from dry-run

[brentstone]

Describe your changes

• Closes Error when quering for staking rewards in epoch 0 #4014.
• Fixes namadac query-proposal without --proposal-id flag

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 74.08%. Comparing base (e768857) to head (755c4ad).
Report is 46 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/proof_of_stake/src/rewards.rs	50.00%	4 Missing ⚠️
crates/sdk/src/tx.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4021      +/-   ##
==========================================
- Coverage   74.09%   74.08%   -0.01%     
==========================================
  Files         341      341              
  Lines      107204   107213       +9     
==========================================
+ Hits        79428    79432       +4     
- Misses      27776    27781       +5     

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