fix: improve error message when no benchmarks are found

Handle the `NoBenchmarks` variant in `ReportConclusion` and display a
warning when results are empty instead of silently showing nothing.

Author: GuillaumeLagrange

src/api_client.rs

@@ -92,6 +92,7 @@ pub enum ReportConclusion {
     AcknowledgedFailure,
     Failure,
     MissingBaseRun,
+    NoBenchmarks,
     Success,
 }
 
@@ -105,6 +106,9 @@ impl Display for ReportConclusion {
             ReportConclusion::MissingBaseRun => {
                 write!(f, "{}", style("Missing Base Run").yellow().bold())
             }
+            ReportConclusion::NoBenchmarks => {
+                write!(f, "{}", style("No Benchmarks").yellow().bold())
+            }
             ReportConclusion::Success => write!(f, "{}", style("Success").green().bold()),
         }
     }

src/upload/poll_results.rs

@@ -72,7 +72,11 @@ pub async fn poll_results(
         ));
     }
 
-    if !response.run.results.is_empty() {
+    if response.run.results.is_empty() {
+        warn!(
+            "No benchmarks were found in the run. Make sure your command runs benchmarks that are instrumented with a CodSpeed integration."
+        );
+    } else {
         end_group!();
         start_group!("Benchmark results");