Fixed following code smells reported by SonarQube:

1) Boolean checks should not be inverted.
 2) Review this redundant assignment.
 3) Extract this nested ternary operation into an independent statement.
 4) Unexpected empty function.
 5) Immediately return this expression instead of assigning it to the temporary variable.

web/pgadmin/tools/backup/static/js/backup.ui.js

@@ -559,8 +559,7 @@ export default class BackupSchema extends BaseUISchema {
         setError('file', errmsg);
         return true;
       } else {
-        errmsg = null;
-        setError('file', errmsg);
+        setError('file', null);
       }
     }
   }

web/pgadmin/tools/backup/static/js/backupGlobal.ui.js

@@ -107,8 +107,7 @@ export default class BackupGlobalSchema extends BaseUISchema {
         setError('file', errmsg);
         return true;
       } else {
-        errmsg = null;
-        setError('file', errmsg);
+        setError('file', null);
       }
     }
   }

web/pgadmin/tools/erd/static/js/erd_tool/dialogs/TableDialog.js

@@ -22,7 +22,7 @@ class EmptySchema extends BaseUISchema {
     return [];
   }
   changeColumnOptions() {
-
+    /*This is intentional (SonarQube)*/
   }
 }
 

web/pgadmin/tools/erd/static/js/erd_tool/index.js

@@ -24,7 +24,7 @@ export default class ERDTool {
   }
 
   getPreferencesForModule() {
-
+    /*This is intentional (SonarQube)*/
   }
 
   render() {

web/pgadmin/tools/grant_wizard/static/js/grant_wizard.js

@@ -88,6 +88,7 @@ define([
           var $container = $('<div class=\'wizard_dlg\' id=\'grantWizardDlg\'></div>');
           return {
             main: function () {
+              /*This is intentional (SonarQube)*/
             },
             setup: function () {
               return {

web/pgadmin/tools/import_export_servers/static/js/import_export_selection.ui.js

@@ -91,8 +91,7 @@ export default class ImportExportSelectionSchema extends BaseUISchema {
         setError('filename', errmsg);
         return true;
       } else {
-        errmsg = null;
-        setError('filename', errmsg);
+        setError('filename', null);
       }
     }
   }

web/pgadmin/tools/import_export_servers/static/js/import_export_servers.js

@@ -61,6 +61,7 @@ export default class ImportExportServersModule {
         var $container = $('<div class=\'wizard_dlg\' id=\'importExportServersDlg\'></div>');
         return {
           main: function () {
+            /*This is intentional (SonarQube)*/
           },
           setup: function () {
             return {

web/pgadmin/tools/restore/static/js/restore.ui.js

@@ -460,8 +460,7 @@ export default class RestoreSchema extends BaseUISchema {
         setError('file', errmsg);
         return true;
       } else {
-        errmsg = null;
-        setError('file', errmsg);
+        setError('file', null);
       }
     }
   }