check_text: Check that an argument that should be a text label has been specified correctly
Description
Check that an argument that should be a text label has been specified correctly
Usage
check_text(arguments, argument_name)
Arguments
arguments
List of the arguments provided to the called function
argument_name
Name of the argument, for inclusion in the error message
Value
Boolean stating the current status of the pre-execution checks, or FALSE if this check fails