fix(unified-search): catch errors in response

Signed-off-by: Kent Delante <kent@delante.me>

When an error response is returned by the unified search api, unified
search shows an endless "Searching" message. This catches the error
and sets the modal into a non-searching state so it no longer
endlessly shows the message.

Author: leftybournes

core/src/components/UnifiedSearch/UnifiedSearchModal.vue

@@ -577,6 +577,9 @@ export default defineComponent({
 
 					this.updateResults(newResults)
 					this.searching = false
+				}).catch((error) => {
+					unifiedSearchLogger.error(error)
+					this.searching = false
 				})
 			}