Silently (warning) fail when <Image> source has empty uri

Summary: fixes #3127
Closes https://github.com/facebook/react-native/pull/3185

Reviewed By: @​svcscm

Differential Revision: D2507588

Pulled By: @nicklockwood

Libraries/Image/Image.android.js

@@ -113,6 +113,14 @@ var Image = React.createClass({
 
   render: function() {
     var source = resolveAssetSource(this.props.source);
+
+    // As opposed to the ios version, here it render `null`
+    // when no source or source.uri... so let's not break that.
+
+    if (source && source.uri === '') {
+      console.warn('source.uri should not be an empty string');
+    }
+
     if (source && source.uri) {
       var isNetwork = source.uri.match(/^https?:/);
       invariant(

Libraries/Image/Image.ios.js

@@ -19,6 +19,7 @@ var NativeModules = require('NativeModules');
 var PropTypes = require('ReactPropTypes');
 var React = require('React');
 var ReactNativeViewAttributes = require('ReactNativeViewAttributes');
+var View = require('View');
 var StyleSheet = require('StyleSheet');
 var StyleSheetPropType = require('StyleSheetPropType');
 
@@ -165,6 +166,11 @@ var Image = React.createClass({
     var {width, height} = source;
     var style = flattenStyle([{width, height}, styles.base, this.props.style]) || {};
 
+    if (source.uri === '') {
+      console.warn('source.uri should not be an empty string');
+      return <View {...this.props} style={style} />;
+    }
+
     var isNetwork = source.uri && source.uri.match(/^https?:/);
     var RawImage = isNetwork ? RCTNetworkImageView : RCTImageView;
     var resizeMode = this.props.resizeMode || (style || {}).resizeMode || 'cover'; // Workaround for flow bug t7737108

Libraries/Image/RCTImageLoader.m

@@ -95,6 +95,10 @@ RCT_EXPORT_MODULE()
                                       progressBlock:(RCTImageLoaderProgressBlock)progressBlock
                                     completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
 {
+  if ([imageTag isEqualToString:@""]) {
+    RCTLogWarn(@"source.uri should not be an empty string <Native>");
+    return nil;
+  }
   NSURL *requestURL = [RCTConvert NSURL:imageTag];
   id<RCTImageURLLoader> loadHandler = [self imageURLLoaderForRequest:requestURL];
   if (!loadHandler) {