Creates a new javafx.beans.binding.BooleanBinding that holds true if a constant value is greater than or equal to the value of a javafx.beans.value.ObservableStringValue.

Note: In this comparison a String that is null is considered equal to an empty String.

Parameters:

op1		the constant value
op2		the ObservableStringValue

Returns:  the new BooleanBinding

Exceptions:

NullPointerException

if the ObservableStringValue is null