message: fix(Input): check to make sure value is not null before attempting to clean it
diff: @@ -1233,7 +1233,7 @@ export class TsInputComponent implements
  }
  // If the unmask regex is a function, invoke it to get the plain regex
  const finalRegex: RegExp = isFunction(regex) ? regex() : regex;
  - return finalRegex ? value.replace(new RegExp(finalRegex), '') : value;
  + return finalRegex && value ? value.replace(new RegExp(finalRegex), '') : value;
  }
  