[gnome-maps] PlaceStore: Fix exists method

[Jonas Danielsson <jonasdn src gnome org>]

commit 2691dbabbefae4b341a9af102c9fa38be2e8a4f5
Author: Jonas Danielsson <jonas threetimestwo org>
Date:   Sat Nov 22 00:56:52 2014 +0100

    PlaceStore: Fix exists method

 src/placeStore.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/placeStore.js b/src/placeStore.js
index 3ed17dc..d35b425 100644
--- a/src/placeStore.js
+++ b/src/placeStore.js
@@ -206,7 +206,7 @@ const PlaceStore = new Lang.Class({
     },
 
     exists: function(osmId, type) {
-        if (type)
+        if (type !== undefined && type !== null)
             return this._typeTable[osmId] === type;
         else
             return this._typeTable[osmId] !== undefined;