message: Fix slash commands null guard
diff: @@ -1049,7 +1049,7 @@ export function parseCommandString(input) {
  // trim any trailing whitespace, as it can confuse the parser for
  // IRC-style commands
  input = input.replace(/\s+$/, '');
  - if (input[0] !== '/') return null; // not a command
  + if (input[0] !== '/') return {}; // not a command
  const bits = input.match(/^(\S+?)(?: +((.|\n)*))?$/);
  let cmd;
  