cli: Show a message when there are no issues to display

This commit fixes the inconsistency with the `rad patch` command,
which previously displayed an empty table when there were no issues. Now,
the CLI will display a message indicating that there are no issues to display.

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

radicle-cli/src/commands/issue.rs

@@ -325,6 +325,11 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
             }
         }
         Operation::List { assigned } => {
+            if issues.is_empty()? {
+                term::print(term::format::italic("Nothing to show."));
+                return Ok(());
+            }
+
             let assignee = match assigned {
                 Some(Assigned::Me) => Some(*profile.id()),
                 Some(Assigned::Peer(id)) => Some(id.into()),

radicle/src/cob/store.rs

@@ -223,6 +223,11 @@ where
         }))
     }
 
+    /// Return true if the list of issues is empty.
+    pub fn is_empty(&self) -> Result<bool, Error> {
+        Ok(self.count()? == 0)
+    }
+
     /// Return objects count.
     pub fn count(&self) -> Result<usize, Error> {
         let raw = cob::list(self.repo, T::type_name())?;