avoid nullptr as the param of fl_value_new_string #15
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rustdesk/rustdesk#4997 (comment)
If the param of
fl_value_new_string
is NULL, this function will not report error.The function returns an error value, which causes crash.
https://github.com/flutter/engine/blob/70b5700b79f6da03ecfb61f6d9135ca3eef51628/shell/platform/linux/fl_value.cc#L642