Remove incorrect statement about hist(..., log=True).

We don't remove zero-count patches, as can easily be checked with e.g.
`print(hist([0, 0, 0, 10], 10, log=True))`.  The incorrect statement
came in in f24d06c, but it is clear that that patch did not implement
that behavior, instead filtering out such patches in
`_update_patch_limits`.

Author: anntzer

lib/matplotlib/axes/_axes.py

@@ -6415,10 +6415,7 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
             Ignored if *histtype* is 'step' or 'stepfilled'.
 
         log : bool, default: False
-            If ``True``, the histogram axis will be set to a log scale. If
-            *log* is ``True`` and *x* is a 1D array, empty bins will be
-            filtered out and only the non-empty ``(n, bins, patches)``
-            will be returned.
+            If ``True``, the histogram axis will be set to a log scale.
 
         color : color or array-like of colors or None, default: None
             Color or sequence of colors, one per dataset.  Default (``None``)