fix: check if update_data contains update before batch_update

[jvdd]

When using FigureWidgetResampler using traces that are not resampled (e.g., Histogram, Bar, etc.), the following action chain resulted in a TypeError (because update_data is NoUpdate)

1. Zoom in in a region
2. Reset the axis (house icon)

Reproducible code:

import numpy as np
from plotly_resampler import FigureWidgetResampler

x = np.random.randn(100)
fig = FigureWidgetResampler(go.Figure(go.Histogram(x=x)))
fig

Error ⬇️

[jvdd]

Not 100% sure whether this is necessary when update_data is NoUpdate
(In the previous logic, this would be executed)

[jvdd]

Quite sure it is correct to only execute this code if update_data is a proper update.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.38%. Comparing base (f58db50) to head (b2f9975).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
- Coverage   96.49%   92.38%   -4.12%     
==========================================
  Files          14       13       -1     
  Lines        1141     1129      -12     
==========================================
- Hits         1101     1043      -58     
- Misses         40       86      +46     

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