Fix cbook._reshape2D for scalar object inputs.

anntzer · anntzer · commit 86a86e2b1d97 · 2017-07-29T16:48:03.000-07:00
Before the fix, `plt.hist(None)` would fail with `x must have 2 or fewer
dimensions`, which it does have.  Now it fails with a bit later with
`unsupported operands type(s) for +: 'NoneType' and 'float'`, which is
hopefully clearer.
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
@@ -1990,7 +1990,7 @@ def _reshape_2D(X, name):
     *name* is used to generate the error message for invalid inputs.
     """
     # Iterate over columns for ndarrays, over rows otherwise.
-    X = X.T if isinstance(X, np.ndarray) else np.asarray(X)
+    X = np.atleast_1d(X.T if isinstance(X, np.ndarray) else np.asarray(X))
     if X.ndim == 1 and X.dtype.type != np.object_:
         # 1D array of scalars: directly return it.
         return [X]
