fix(cli): remove extra Error from the message

[shcheklein]

Instead of:

(.venv) √ Projects/cattle-care-train % datachain ds pull ds://something
Error: Error from server: Dataset something not found

we now do:

(.venv) √ Projects/cattle-care-train % datachain ds pull ds://something
Error: Dataset something not found

I think this should be enough

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[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.

Project coverage is 88.06%. Comparing base (79f6cf9) to head (7d6414e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/datachain/studio.py	0.00%	8 Missing ⚠️
src/datachain/catalog/catalog.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #905      +/-   ##
==========================================
+ Coverage   87.69%   88.06%   +0.36%     
==========================================
  Files         130      129       -1     
  Lines       11664    11367     -297     
  Branches     1586     1541      -45     
==========================================
- Hits        10229    10010     -219     
+ Misses       1038      968      -70     
+ Partials      397      389       -8     

Flag	Coverage Δ
datachain	87.98% <23.07%> (+0.36%)	⬆️

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