fix find-replace bugs

* Fixes dropdown closing bug when clicked on find-replace inputs

* Disables find-replace with undefined params

Author: harunurhan

src/find-replace/find-replace.component.ts

@@ -60,6 +60,9 @@ export class FindReplaceComponent {
   }
 
   findAndReplace() {
+    if (!(this.find && this.replace)) {
+      return;
+    }
     let value = this.jsonStoreService.getIn(this.path);
     let result = this.findReplaceAllService
       .findReplaceInImmutable(value, this.schema, this.find, this.replace, this.exactPhrase);

src/sub-record/sub-record.component.html

@@ -19,7 +19,7 @@
               <button type="button" class="editor-btn-delete editor-btn-delete-text" (click)="deleteField(key)">Delete</button>
             </li>
             <li class="divider"></li>
-            <li class="title-dropdown-item">
+            <li class="title-dropdown-item" (click)="$event.stopPropagation()">
               <find-replace [path]="getPathForField(key)" [schema]="schema.properties[key]"></find-replace>
             </li>
           </title-dropdown>