print_popover_form_contents should be an abstract method

Author: aristath

classes/suggested-tasks/providers/class-email-sending.php

@@ -292,4 +292,13 @@ protected function the_popover_content() {
 			]
 		);
 	}
+
+	/**
+	 * Print the popover form contents.
+	 *
+	 * @return void
+	 */
+	public function print_popover_form_contents() {
+		// The form is handled in the popovers/email-sending view.
+	}
 }

classes/suggested-tasks/providers/class-tasks-interactive.php

@@ -151,8 +151,7 @@ public function print_popover_instructions() {
 	 *
 	 * @return void
 	 */
-	public function print_popover_form_contents() {
-	}
+	abstract public function print_popover_form_contents();
 
 	/**
 	 * Enqueue the scripts.