Show specific empty message for tag input fields

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

apps/systemtags/js/systemtagsfilelist.js

@@ -115,6 +115,9 @@
 				escapeMarkup: function(m) {
 					// prevent double markup escape
 					return m;
+				},
+				formatNoMatches: function() {
+					return t('systemtags', 'No tags found');
 				}
 			});
 			this.$filterField.on('change', _.bind(this._onTagsChanged, this));

core/js/systemtags/systemtagsinputfield.js

@@ -408,6 +408,9 @@
 						return 1;
 					});
 					return results;
+				},
+				formatNoMatches: function() {
+					return t('core', 'No tags found');
 				}
 			})
 				.on('select2-selecting', this._onSelectTag)