fixed readonly being always False when editing arrays (doh!)

Author: gdementen

larray_editor/arraywidget.py

@@ -530,7 +530,8 @@ def __init__(self, parent, data=None, readonly=False, bg_value=None, bg_gradient
                  minvalue=None, maxvalue=None):
         QWidget.__init__(self, parent)
         assert bg_gradient in gradient_map
-        readonly = np.isscalar(data)
+        if data is not None and np.isscalar(data):
+            readonly = True
         self.readonly = readonly
 
         self.model_axes = LabelsArrayModel(parent=self, readonly=readonly)