Remove lodash omit

(re: #6087)

modules/util/index.js

@@ -19,6 +19,7 @@ export { utilHighlightEntities } from './util';
 export { utilIdleWorker } from './idle_worker';
 export { utilKeybinding } from './keybinding';
 export { utilNoAuto } from './util';
+export { utilObjectOmit } from './object';
 export { utilPrefixCSSProperty } from './util';
 export { utilPrefixDOMProperty } from './util';
 export { utilPreset } from './util';

modules/util/object.js

@@ -0,0 +1,9 @@
+
+export function utilObjectOmit(obj, omitKeys) {
+    return Object.keys(obj).reduce(function(result, key) {
+        if (omitKeys.indexOf(key) === -1) {
+            result[key] = obj[key];  // keep
+        }
+        return result;
+    }, {});
+}

modules/util/util.js

@@ -1,5 +1,3 @@
-import _map from 'lodash-es/map';
-
 import { t, textDirection } from './locale';
 import { utilDetect } from './detect';
 import { remove as removeDiacritics } from 'diacritics';
@@ -7,7 +5,9 @@ import { fixRTLTextForSvg, rtlRegex } from './svg_paths_rtl_fix';
 
 
 export function utilTagText(entity) {
-    return _map(entity.tags, function(v, k) {
+    var obj = (entity && entity.tags) || {};
+    return Object.keys(obj).map(function(k) {
+        var v = obj[k];
         return k + '=' + v;
     }).join(', ');
 }