Merge pull request #6 from neoswallow/patch-1

Update index.js for possible crash with RN 0.59.9

Author: wonday

index.js

@@ -148,7 +148,7 @@ export default class CachedImage extends Component {
 
         if (this.state.source) {
 
-            const renderImage = (props, children) => (children ?
+            const renderImage = (props, children) => (children != null ?
                 <ImageBackground {...props}>{children}</ImageBackground> :
                 <Image {...props}/>);
 
@@ -289,4 +289,4 @@ async function _saveCacheFile(url: string, success: Function, failure: Function)
     } catch (error) {
         failure && failure(error);
     }
-}
+}