fix(@desktop/profile): handle empty text in add contact properly

fixes #3046

also fix the fact that the query is only triggered when the text is changed
vs when pressing any key

ui/app/AppLayouts/Profile/Sections/ContactsContainer.qml

@@ -159,8 +159,11 @@ Item {
                 placeholderText: qsTrId("enter-contact-code")
                 customHeight: 44
                 fontPixelSize: 15
-                Keys.onReleased: {
-                    if (text !== "") {
+                onTextEdited: {
+                    if (addContactSearchInput.text === "") {
+                        searchResults.reset();
+                        return;
+                    }
                     if (!addContactModal.validate(addContactSearchInput.text)) {
                         searchResults.reset();
                         contactsContainer.isPending = false;
@@ -168,9 +171,6 @@ Item {
                     }
 
                     Qt.callLater(addContactModal.lookupContact, addContactSearchInput.text);
-                    } else {
-                        addContactModal.validationError = "";
-                    }
                 }