94968. r/sr=mscott. fix the folder-picker to not show bogus folders.

mailnews/base/resources/content/commandglue.js

@@ -55,7 +55,10 @@ function GetMsgFolderFromResource(folderResource)
      return null;
 
   var msgFolder = folderResource.QueryInterface(Components.interfaces.nsIMsgFolder);
+  if (msgFolder && (msgFolder.parent || msgFolder.isServer))
     return msgFolder;
+  else
+    return null;
 }
 
 function GetMsgFolderFromURI(folderURI)

mailnews/base/resources/content/mailCommands.js

@@ -25,6 +25,7 @@ function GetMsgFolderFromUri(uri)
 	try {
 		var resource = GetResourceFromUri(uri);
 		var msgfolder = resource.QueryInterface(Components.interfaces.nsIMsgFolder);
+        if (msgfolder && (msgfolder.parent || msgfolder.isServer))
 		  return msgfolder;
 	}
 	catch (ex) {

mailnews/compose/resources/content/MsgComposeCommands.js

@@ -2346,6 +2346,7 @@ function GetMsgFolderFromUri(uri)
   	RDF = RDF.QueryInterface(Components.interfaces.nsIRDFService);
     var resource = RDF.GetResource(uri);
 		var msgfolder = resource.QueryInterface(Components.interfaces.nsIMsgFolder);
+        if (msgfolder && ( msgfolder.parent || msgfolder.isServer))
 		  return msgfolder;
 	}//try
 	catch (ex) { }//catch