fix: panic in non-interactive mode when no providers set up

closes #212

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

internal/cmd/root.go

@@ -105,6 +105,10 @@ crush run -q "Generate a README for this project"
 		}
 		defer app.Shutdown()
 
+		if !app.Config().IsConfigured() {
+			return fmt.Errorf("no providers configured - please run 'crush' to set up a provider interactively")
+		}
+
 		prompt := strings.Join(args, " ")
 
 		prompt, err = maybePrependStdin(prompt)