animint.js: remove unnecessary Selectors.hasOwnProperty checks

[ANAMASGARD]

Fixes #278

• Replaced Selectors.hasOwnProperty(selector_name) with a simple selector_name check in draw_geom and geom_label_aligned.
• Removed redundant guard in update_selector.
• Removed Selectors.hasOwnProperty check in update_axes.

I confirm I have not used any AI code generation tools for this PR.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.08%. Comparing base (543d0d9) to head (80f1208).

Files with missing lines	Patch %	Lines
inst/htmljs/animint.js	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
- Coverage   73.09%   73.08%   -0.01%     
==========================================
  Files         164      164              
  Lines        8769     8766       -3     
==========================================
- Hits         6410     6407       -3     
  Misses       2359     2359              

Flag	Coverage Δ
javascript	80.76% <50.00%> (-0.03%)	⬇️
r	69.57% <ø> (ø)

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[tdhock]

also please investigate CI failure

[ANAMASGARD]

Sir @tdhock , if(selector_name) guards in Changes 1 and 2 cannot be removed safely — [selector_name] is null on initial geom rendering, so without the guards, Selectors[null].duration throws a TypeError and breaks all 149 JS tests.
The guards are not about checking hasOwnProperty on [Selectors]; they handle the case where no selector is active at all.
I removed them in previous commit which caused error , please give your feedback .

[tdhock]

please revise

[tdhock]

ok i see now " [selector_name] is null on initial geom rendering" why and when does that happen?
i thought none of these blocks should run (and we can do no rendering) if we don’t have json info? (including selectors)