message: Only print backtrace if frames are detected
diff: @@ -230,6 +230,7 @@ extern "C" fn signal_trap_handler(
  unwind_result = Box::new(image);
  } else {
  use colored::*;
  + if es_image.frames.len() > 0 {
  eprintln!(
  "\n{}",
  "Wasmer encountered an error while running your WebAssembly program."
  @@ -238,6 +239,8 @@ extern "C" fn signal_trap_handler(
  );
  es_image.print_backtrace_if_needed();
  }
  + // Just let the error propagate otherrwise
  + }
  true
  });
  