fix: Suppress RunTime warnings for negative size values (#6744)

Author: Azaya89

holoviews/plotting/mpl/element.py

@@ -660,7 +660,7 @@ def init_artists(self, ax, plot_args, plot_kwargs):
         if 'norm' in plot_kwargs: # vmin/vmax should now be exclusively in norm
             plot_kwargs.pop('vmin', None)
             plot_kwargs.pop('vmax', None)
-        with warnings.catch_warnings():
+        with (warnings.catch_warnings(), np.errstate(invalid="ignore")):
             # scatter have a default cmap and with an empty array will emit this warning
             warnings.filterwarnings('ignore', "No data for colormapping provided via 'c'")
             artist = plot_fn(*plot_args, **plot_kwargs)

holoviews/plotting/mpl/renderer.py

@@ -1,11 +1,12 @@
 import base64
 import os
-from contextlib import contextmanager
+from contextlib import contextmanager, suppress
 from io import BytesIO
 from itertools import chain
 from tempfile import NamedTemporaryFile
 
 import matplotlib as mpl
+import numpy as np
 import param
 from matplotlib import pyplot as plt
 from param.parameterized import bothmethod
@@ -163,13 +164,12 @@ def _figure_data(self, plot, fmt, bbox_inches='tight', as_script=False, **kwargs
             )
             kw.update(kwargs)
 
-            # Attempts to precompute the tight bounding box
-            try:
-                kw = self._compute_bbox(fig, kw)
-            except Exception:
-                pass
-            bytes_io = BytesIO()
-            fig.canvas.print_figure(bytes_io, **kw)
+            with np.errstate(invalid="ignore"):
+                with suppress(Exception):
+                    # Attempts to precompute the tight bounding box
+                    kw = self._compute_bbox(fig, kw)
+                bytes_io = BytesIO()
+                fig.canvas.print_figure(bytes_io, **kw)
             data = bytes_io.getvalue()
 
         if as_script: