Include empty strings in fn isEmpty(val)

ipmd/static/ipmd/js/ipmdlib.js

@@ -521,13 +521,13 @@ function getUnix(aDate)
 }
 
 /**
- * Saves a bit of typing. Currently checks if the val is either undefined or null
+ * Saves a bit of typing. Currently checks if the val is either undefined or null, and if a string == ""
  * @param {Object} val 
  * @returns {Boolean} true if the value is considered empty
  */
 function isEmpty(val)
 {
-    return val === undefined || val === null;
+    return val === undefined || val === null || (typeof val === "string" && val.trim() == "");
 }
 
 // Keeping track of maps