Fix out of bounds panic (#16)

anyrun/src/main.rs

@@ -390,6 +390,7 @@ fn activate(app: &gtk::Application, runtime_data: Rc<RefCell<Option<RuntimeData>
                     Some(selected) => selected,
                     None => {
                         // If nothing is selected select either the top or bottom match based on the input
+                        if !combined_matches.is_empty() {
                             match event.keyval() {
                                 constants::Down | constants::Tab => combined_matches[0]
                                     .1
@@ -399,6 +400,7 @@ fn activate(app: &gtk::Application, runtime_data: Rc<RefCell<Option<RuntimeData>
                                     .select_row(Some(&combined_matches[combined_matches.len() - 1].0)),
                                 _ => unreachable!(),
                             }
+                        }
                         return Inhibit(true);
                     }
                 };