Fixes mattermost#498: "Validation Message Should be User Friendly" (m…

…attermost#764)

* validated issueTitle by removing leading/trailing space

* removed redundant bool type casting

webapp/src/components/modals/create_issue/create_issue.jsx

@@ -61,9 +61,10 @@ export default class CreateIssueModal extends PureComponent {
             e.preventDefault();
         }
 
-        if (!this.validator.validate() || !this.state.issueTitle) {
+        const isValidTitle = this.state.issueTitle.trim().length !== 0;
+        if (!this.validator.validate() || !isValidTitle) {
             this.setState({
-                issueTitleValid: Boolean(this.state.issueTitle),
+                issueTitleValid: isValidTitle,
                 showErrors: true,
             });
             return;