cli: Suggest the user to reset the cache

If there is an error loading a patch or issue, suggest resetting the
cache.

radicle-cli/src/commands/issue.rs

@@ -496,7 +496,11 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
         Operation::Show { id, format, debug } => {
             let id = id.resolve(&repo.backend)?;
             let issue = issues
-                .get(&id)?
+                .get(&id)
+                .map_err(|e| Error::WithHint {
+                    err: e.into(),
+                    hint: "reset the cache with `rad issue cache` and try again",
+                })?
                 .context("No issue with the given ID exists")?;
             if debug {
                 println!("{:#?}", issue);

radicle-cli/src/commands/patch/show.rs

@@ -33,7 +33,11 @@ pub fn run(
     workdir: Option<&git::raw::Repository>,
 ) -> anyhow::Result<()> {
     let patches = profile.patches(stored)?;
-    let Some(patch) = patches.get(patch_id)? else {
+    let Some(patch) = patches.get(patch_id).map_err(|e| Error::WithHint {
+        err: e.into(),
+        hint: "reset the cache with `rad patch cache` and try again",
+    })?
+    else {
         anyhow::bail!("Patch `{patch_id}` not found");
     };