net/src/main/java/com/stanfy/enroscar/net/cache/CacheEntry.java
protected final void writeString(final Writer writer, final String line) throws IOException {
    if (line != null) {
      writer.write(line + '\n');
    } else {
      writer.write('\n');
    }
  }
protected final void writeString(final Writer writer, final String line) throws IOException {
    if (line != null) {
      writer.write(line + '\n');
    } else {
      writer.write('\n');
    }
  }
Write next line to the output.
@param writer output writer
@param line line to write (if null just a new empty line is inserted)
@throws IOException if error happens