blockEmpty.createTextLine(null): null
blockEmpty.createTextLine(null, -1): null
block.createTextLine(null, -1): error ArgumentError: Error #2004: One of the parameters is invalid.
	at Error$/throwError()
	at flash.text.engine::TextBlock/createTextLine()
	at Test()
block.createTextLine(null, 1000001): error ArgumentError: Error #2004: One of the parameters is invalid.
	at Error$/throwError()
	at flash.text.engine::TextBlock/createTextLine()
	at Test()
block.createTextLine(invalidLine): error ArgumentError: Error #2004: One of the parameters is invalid.
	at Error$/throwError()
	at flash.text.engine::TextBlock/createTextLine()
	at Test()
block.createTextLine(line2): error ArgumentError: Error #2004: One of the parameters is invalid.
	at Error$/throwError()
	at flash.text.engine::TextBlock/createTextLine()
	at Test()
Error: Error #2175: One or more elements of the content of the TextBlock has a null ElementFormat.
	at flash.text.engine::TextBlock/DoCreateTextLine()
	at flash.text.engine::TextBlock/createTextLine()
	at Test()
blockFormatless.createTextLine(null): null
