Resolve null pointer issue in DefaultJsUriManager.java (issue869047)

[zh...@gmail.com]

Reviewers: shindig.remailer_gmail.com, johnfargo,

Description:
DefaultJsUriManager should use the uri in the gadget context instead of
the gadget spec, since it can be used without spec defined.


Please review this at http://codereview.appspot.com/869047/show

Affected files:
    
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultJsUriManager.java


### Eclipse Workspace Patch 1.0
#P shindig-project
Index:  
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultJsUriManager.java
===================================================================
---  
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultJsUriManager.java	 
(revision 932644)
+++  
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultJsUriManager.java	 
(working copy)
@@ -18,19 +18,18 @@
   */
  package org.apache.shindig.gadgets.uri;

-import java.util.Collection;
+import com.google.common.collect.Lists;
+import com.google.inject.Inject;

  import org.apache.commons.lang.StringUtils;
-import org.apache.shindig.config.ContainerConfig;
  import org.apache.shindig.common.uri.Uri;
  import org.apache.shindig.common.uri.UriBuilder;
+import org.apache.shindig.config.ContainerConfig;
  import org.apache.shindig.gadgets.Gadget;
  import org.apache.shindig.gadgets.uri.UriCommon.Param;

-import com.google.common.collect.Lists;
-import com.google.inject.Inject;
-
  import java.util.Arrays;
+import java.util.Collection;

  /**
   * Generates and validates URLs serviced by a gadget JavaScript service  
(JsServlet).
@@ -88,7 +87,7 @@
      // Finally, version it, but only if !nocache.
      if (versioner != null && !gadget.getContext().getIgnoreCache()) {
        uri.addQueryParameter(Param.VERSION.getKey(),
-          versioner.version(gadget.getSpec().getUrl(), container, extern));
+          versioner.version(gadget.getContext().getUrl(), container,  
extern));
      }

      return uri.toUri();