If PIL.image is missing, tell user to install pillow

dstansby · dstansby · commit 802ed1f8b277 · 2017-10-11T13:35:11.000+01:00
diff --git a/doc/conf.py b/doc/conf.py
@@ -55,7 +55,10 @@ def _check_deps():
         try:
             __import__(name)
         except ImportError:
-            missing.append(name)
+            if name == 'PIL.Image':
+                missing.append('pillow')
+            else:
+                missing.append(name)
     if missing:
         raise ImportError(
             "The following dependencies are missing to build the "
