return exit code of 1 if no results found (#386)

Signed-off-by: Bob Callaway <bob.callaway@gmail.com>

cmd/rekor-cli/app/search.go

@@ -196,6 +196,10 @@ var searchCmd = &cobra.Command{
 			}
 		}
 
+		if len(resp.Payload) == 0 {
+			return nil, fmt.Errorf("no matching entries found")
+		}
+
 		return &searchCmdOutput{
 			uuids: resp.GetPayload(),
 		}, nil

tests/e2e_test.go

@@ -226,6 +226,10 @@ func TestGet(t *testing.T) {
 	outputContains(t, out, uuid)
 }
 
+func TestSearchNoEntriesRC1(t *testing.T) {
+	runCliErr(t, "search", "--email", "noone@internetz.com")
+}
+
 func TestMinisign(t *testing.T) {
 	// Create a keypair
 	keyPath := filepath.Join(t.TempDir(), "minisign.key")