Fixed usage of arguments in add_colorbar

corny/figures.py

@@ -455,11 +455,11 @@ def add_colorbar(ax=None, points=None, label=None,
             ):
             
     cb = plt.colorbar(points, ax=ax, **bar_kw)
-    if ticks:
+    if not ticks is None:
         cb.ax.set_yticks(ticks)
-    if ticklabels:
+    if not ticklabels is None:
         cb.ax.set_yticklabels(ticklabels, **ticks_kw)
-    if label:
+    if not label is None:
         cb.set_label(label, **label_kw)
 
 def set_time_ticks(ax=None, how=None, which='major', fmt=None):