Updates to search controller

lib/l10n/app_en.arb

@@ -640,6 +640,9 @@
   "quantityPositive": "Quantity must be positive",
   "@quantityPositive": {},
 
+  "queryEmpty": "Enter search query",
+  "@queryEmpty": {},
+
   "queryNoResults": "No results for query",
   "@queryNoResults": {},
 

lib/widget/home.dart

@@ -378,11 +378,11 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> {
             icon: _notificationCounter == 0 ? FaIcon(FontAwesomeIcons.bell) : Stack(
               children: <Widget>[
                 FaIcon(FontAwesomeIcons.bell),
-                new Positioned(
+                Positioned(
                   right: 0,
-                  child: new Container(
+                  child: Container(
                     padding: EdgeInsets.all(2),
-                    decoration: new BoxDecoration(
+                    decoration: BoxDecoration(
                       color: Colors.red,
                       borderRadius: BorderRadius.circular(20),
                     ),
@@ -390,9 +390,9 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> {
                       minWidth: 12,
                       minHeight: 12,
                     ),
-                    child: new Text(
+                    child: Text(
                       "${_notificationCounter}",
-                      style: new TextStyle(
+                      style: TextStyle(
                         color: Colors.white,
                         fontSize: 9,
                       ),

lib/widget/notifications.dart

@@ -1,6 +1,4 @@
 
-
-import "package:flutter/cupertino.dart";
 import "package:flutter/material.dart";
 
 import "package:font_awesome_flutter/font_awesome_flutter.dart";

lib/widget/search.dart

@@ -21,7 +21,7 @@ import "package:inventree/widget/location_list.dart";
 // Widget for performing database-wide search
 class SearchWidget extends StatefulWidget {
 
-  SearchWidget(this.hasAppbar);
+  const SearchWidget(this.hasAppbar);
 
   final bool hasAppbar;
 
@@ -172,12 +172,15 @@ class _SearchDisplayState extends RefreshableState<SearchWidget> {
         child: ListTile(
           title: TextField(
             readOnly: false,
+            decoration: InputDecoration(
+              helperText: L10().queryEmpty,
+            ),
             controller: searchController,
             onChanged: (String text) {
               onSearchTextChanged(text);
             },
           ),
-          leading: IconButton(
+          trailing: IconButton(
             icon: FaIcon(FontAwesomeIcons.backspace, color: Colors.red),
             onPressed: () {
               searchController.clear();
@@ -332,7 +335,7 @@ class _SearchDisplayState extends RefreshableState<SearchWidget> {
       );
     }
 
-    if (results.isEmpty) {
+    if (results.isEmpty && searchController.text.isNotEmpty) {
       tiles.add(
         ListTile(
           title: Text(L10().queryNoResults),