fix delete show song and not deleted order song causes crash

.run/start.run.xml

@@ -7,6 +7,9 @@
     </scripts>
     <node-interpreter value="project" />
     <envs />
+    <EXTENSION ID="com.intellij.lang.javascript.buildTools.npm.rc.StartBrowserRunConfigurationExtension">
+      <browser name="98ca6316-2f89-46d9-a9e5-fa9e2b0625b3" start="true" with-js-debugger="true" url="http://localhost.4200" />
+    </EXTENSION>
     <method v="2" />
   </configuration>
 </component>

src/app/modules/shows/services/docx.service.ts

@@ -213,7 +213,7 @@ export class DocxService {
             sections: Section[];
           }
       );
-    const songs = show.order.map(_ => songsLoaded.filter(f => f.showSong.id === _)[0]);
+    const songs = show.order.map(_ => songsLoaded.find(f => f.showSong.id === _)).filter(_ => !!_);
     return {songs, show, user, config};
   }