[FLINK-38899][runtime-web] Introduce the Rescales/History sub-page for streaming jobs with the adaptive scheduler enabled - Temporary commit for review (Changed the display method when the variable is empty)

Author: och5351

flink-runtime-web/web-dashboard/src/app/pages/job/rescales/job-rescales.component.html

@@ -145,12 +145,12 @@ <h3><strong>Rescale Details</strong></h3>
                       <nz-divider nzType="vertical"></nz-divider>
                       <span>
                         <strong>Terminal State:</strong>
-                        {{ history.terminalState }}
+                        {{ history?.terminalState || '-' }}
                       </span>
                       <nz-divider nzType="vertical"></nz-divider>
                       <span>
                         <strong>Terminal Reason:</strong>
-                        {{ history.terminatedReason }}
+                        {{ history?.terminatedReason || '-' }}
                       </span>
                     </td>
                   </tr>