Merge pull request square#624 from square/jw/nully

Account for null paths when naming a Request.

Author: dnkoutso

picasso/src/main/java/com/squareup/picasso/Request.java

@@ -144,7 +144,7 @@ String plainId() {
 
   String getName() {
     if (uri != null) {
-      return uri.getPath();
+      return String.valueOf(uri.getPath());
     }
     return Integer.toHexString(resourceId);
   }