Fixes edge-app delete (#235)

* fix: Handle missing edge app in get_app

The `get_app` function panicked when trying to access the first element
of the returned app list if the list was empty (e.g., app not found).

This commit adds a check for an empty list in `get_app` and returns
a `ResourceNotFound` error in that case. It also adds the
`ResourceNotFound` variant to the `CommandError` enum.

* Bumps deps

* run clippy

* Rolls back Cargo.lock

* Backward compatability

* Fixes compatability issues

* Rename ResourceNotFound to AppNotFound

Author: vpetersson

src/api/edge_app/app.rs

@@ -73,7 +73,15 @@ impl Api {
             &format!("v4/edge-apps?select=name&id=eq.{}", app_id),
         )?;
 
-        Ok(serde_json::from_value::<Vec<EdgeApp>>(response)?[0].clone())
+        let apps = serde_json::from_value::<Vec<EdgeApp>>(response)?;
+        if apps.is_empty() {
+            Err(CommandError::AppNotFound(format!(
+                "Edge app with ID '{}' not found.",
+                app_id
+            )))
+        } else {
+            Ok(apps[0].clone())
+        }
     }
 
     pub fn copy_assets(&self, payload: Value) -> Result<Vec<String>, CommandError> {

src/commands/mod.rs

@@ -130,6 +130,8 @@ pub enum CommandError {
     PathIsNotDirError(String),
     #[error("Missing installation id in the instance file")]
     MissingInstallationId,
+    #[error("App not found: {0}")]
+    AppNotFound(String),
 }
 
 pub fn get(