enh: Remove use of explicit raise Exception

[hoxbro]

Description

Remove the use of explicit raise Exception

How Has This Been Tested?

AI Disclosure

• This PR contains AI-generated content.
  • I have tested all AI-generated content in my PR.
  • I take responsibility for all AI-generated content in my PR.

Tools and Models: Sonnet 4.6 + Opencode, Asked it to remove bare raise Exception

Checklist

• Pull request title follows the conventional format
• Tests added and is passing

[codecov]

Codecov Report

❌ Patch coverage is 6.52174% with 86 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.22%. Comparing base (7971661) to head (6416829).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
holoviews/core/spaces.py	0.00%	12 Missing ⚠️
holoviews/core/io.py	0.00%	9 Missing ⚠️
holoviews/core/options.py	11.11%	8 Missing ⚠️
holoviews/plotting/util.py	0.00%	6 Missing ⚠️
holoviews/util/__init__.py	0.00%	5 Missing ⚠️
holoviews/core/element.py	0.00%	4 Missing ⚠️
holoviews/operation/element.py	0.00%	4 Missing ⚠️
holoviews/plotting/plot.py	0.00%	4 Missing ⚠️
holoviews/core/data/__init__.py	0.00%	3 Missing ⚠️
holoviews/core/dimension.py	0.00%	3 Missing ⚠️
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6866      +/-   ##
==========================================
- Coverage   89.22%   89.22%   -0.01%     
==========================================
  Files         340      340              
  Lines       73955    73955              
==========================================
- Hits        65990    65987       -3     
- Misses       7965     7968       +3     

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