[Search] Input checks

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

platform/persistence/elastic/src/ElasticSearchProvider.js

@@ -148,7 +148,7 @@ 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/controllers/SearchController.js

@@ -40,7 +40,9 @@ define(function () {
             var inputText = $scope.ngModel.input;
             
             // We are starting to load.
-            loading = true;
+            if (inputText !== '' && inputText !== undefined) {
+                loading = true;
+            }
             
             // Update whether the file tree should be displayed 
             // Hide tree only when starting search 

platform/search/src/services/GenericSearchProvider.js

@@ -184,31 +184,37 @@ define(
                 });
             }
             
-            
             // For documentation, see query below
             function query(input, timestamp, maxResults, timeout) {
                 var terms = [],
                     searchResults = [],
                     defer = $q.defer();
                 
-                // Allow us to access this promise later to resolve it later
+                // If the input is nonempty, do a search
-                pendingQueries[timestamp] = defer;
+                if (input !== '' && input !== undefined) {
                     
-                // Check to see if the user provided a maximum 
+                    // Allow us to access this promise later to resolve it later
-                //   number of results to display
+                    pendingQueries[timestamp] = defer;
-                if (!maxResults) {
+                
-                    // Else, we provide a default value
+                    // Check to see if the user provided a maximum 
-                    maxResults = DEFAULT_MAX_RESULTS;
+                    //   number of results to display
+                    if (!maxResults) {
+                        // Else, we provide a default value
+                        maxResults = DEFAULT_MAX_RESULTS;
+                    }
+                    // Similarly, check if timeout was provided
+                    if (!timeout) {
+                        timeout = DEFAULT_TIMEOUT;
+                    }
+
+                    // Send the query to the worker
+                    workerSearch(input, maxResults, timestamp, timeout);
+
+                    return defer.promise;
+                } else {
+                    // Otherwise return an empty result
+                    return {hits: [], total: 0};
                 }
-                // Similarly, check if timeout was provided
-                if (!timeout) {
-                    timeout = DEFAULT_TIMEOUT;
-                }
-                
-                // Send the query to the worker
-                workerSearch(input, maxResults, timestamp, timeout);
-                
-                return defer.promise;
             }
             
             // Index the tree's contents once at the beginning