[Search] Input checks

More checks to see if the input is empty
before doing search computations.

platform/persistence/elastic/src/ElasticsearchSearchProvider.js

@@ -149,7 +149,7 @@ define(
                 }
                 
                 // If the user input is empty, we want to have no search results.
-                if (searchTerm !== '') {
+                if (searchTerm !== '' && searchTerm !== undefined) {
                     // Process the search term
                     searchTerm = processSearchTerm(searchTerm);
 

platform/search/src/GenericSearchProvider.js

@@ -191,6 +191,9 @@ define(
                     searchResults = [],
                     defer = $q.defer();
                 
+                // If the input is nonempty, do a search
+                if (input !== '' && input !== undefined) {
+                    
                     // Allow us to access this promise later to resolve it later
                     pendingQueries[timestamp] = defer;
                 
@@ -209,6 +212,10 @@ define(
                     workerSearch(input, maxResults, timestamp, timeout);
 
                     return defer.promise;
+                } else {
+                    // Otherwise return an empty result
+                    return {hits: [], total: 0};
+                }
             }
             
             // Index the tree's contents once at the beginning