Fixes #103. Tests pending.

src/managed/OpenLiveWriter.Localization/DisplayMessages.xml

@@ -649,7 +649,7 @@
     Type="Exclamation"
     Buttons="YesNo" 
     Title="Open Live Writer"
-    Text="{0}
Not a valid URL.
Do you want to continue?"
+    Text="{0}
Not a valid URL.
Do you want to go back and edit the URL?"
     comment:Text="{0} - the url that was entered"/>
 	<Message
 	  Identifier="InvalidInsertionPoint"

src/managed/OpenLiveWriter.Localization/Properties.resx

@@ -2835,7 +2835,7 @@ Check the file name and try again.</value>
   <data name="DisplayMessage.InputIsNotUrl.Text" xml:space="preserve">
     <value>{0}
 Not a valid URL.
-Do you want to continue?</value>
+Do you want to go back and edit the URL?</value>
   <comment>{0} - the url that was entered</comment></data>
   <data name="DisplayMessage.InputIsNotUrl.Title" xml:space="preserve">
     <value>Open Live Writer</value>

src/managed/OpenLiveWriter.PostEditor/ImageInsertion/WebImages/WebImageForm.cs

@@ -48,10 +48,11 @@ namespace OpenLiveWriter.PostEditor.ImageInsertion.WebImages
         {
             if (!UrlHelper.IsUrl(_source.SourceImageLink))
             {
-                if (DisplayMessage.Show(MessageId.InputIsNotUrl, this, _source.SourceImageLink) == System.Windows.Forms.DialogResult.No)
+                //Ask if they want to go back and correct the link or just abort it altogether
+                if (DisplayMessage.Show(MessageId.InputIsNotUrl, this, _source.SourceImageLink) == System.Windows.Forms.DialogResult.Yes)
                     return;
             }
-            DialogResult = System.Windows.Forms.DialogResult.OK;
+            DialogResult = System.Windows.Forms.DialogResult.Abort;
         }
 
     }

src/managed/OpenLiveWriter.PostEditor/PostHtmlEditing/ImageEditing/ImageEditingPropertyHandler.cs

@@ -95,15 +95,15 @@ namespace OpenLiveWriter.PostEditor.PostHtmlEditing
                     imgHtmlElement.setAttribute("height", oldHeight, 0);
                 if (!String.IsNullOrEmpty(oldWidth))
                     imgHtmlElement.setAttribute("width", oldWidth, 0);
-
                 try
                 {
                     info = new ImagePropertiesInfo(new Uri(imgSrc), new Size(width, height), remoteImageDecoratorsList);
                 }
                 catch (UriFormatException)
                 {
-                    DisplayMessage.Show(MessageId.InvalidWebImage);
-                    return null;
+                    DisplayMessage.Show(MessageId.NoSuchImageFile);
+                    imgHtmlElement.setAttribute("src", "https://browshot.com/static/images/not-found.png");
+                    info = new ImagePropertiesInfo(new Uri("https://browshot.com/static/images/not-found.png"), new Size(width, height), remoteImageDecoratorsList);
                 }
                 info.ImgElement = imgHtmlElement;