fix: out of bounds error, closes [#8]

use .is_some() and if let Some() to make sure that container indexes are still valid, without can cause out of bounds issue due to docker update frequencies

src/app_data/container_state.rs

@@ -160,7 +160,7 @@ impl DockerControls {
         match state {
             State::Dead | State::Exited => vec![Self::Start, Self::Restart],
             State::Paused => vec![Self::Unpause, Self::Stop],
-			State::Restarting => vec![Self::Stop],
+            State::Restarting => vec![Self::Stop],
             State::Running => vec![Self::Pause, Self::Restart, Self::Stop],
             _ => vec![],
         }