[6.19.z] Harden apply_erratas entity failed search (#2476)

(cherry picked from commit 68ff28d)

Co-authored-by: Ladislav Vašina <lvasina@redhat.com>

Author: Satellite-QE

airgun/entities/host_new.py

@@ -520,6 +520,9 @@ def apply_erratas(self, entity_name, search=None):
         param: search (string): search value to filter results.
         example: search="errata_id == {ERRATA_ID}"
         default: None; all available errata are returned and installed.
+
+        Raises:
+            ValueError: If a search was provided but returned no matching errata.
         """
         view = self.navigate_to(self, 'NewDetails', entity_name=entity_name)
         view.wait_displayed()
@@ -532,6 +535,8 @@ def apply_erratas(self, entity_name, search=None):
         # wait for filter to apply
         view.content.errata.wait_displayed()
         self.browser.plugin.ensure_page_safe()
+        if search is not None and not view.content.errata.table.is_displayed:
+            raise ValueError(f'No errata found matching search: {search}')
         view.content.errata.select_all.click()
         view.content.errata.apply.fill('Apply')
         view.flash.assert_no_error()