Potential issue in error case management

[vigourouxc]

Hi,

It seems that this line of code is broken:

verificatum-vjsc/src/js/verificatum/arithm/PPRing.js

Line 279 in 85eae03

elements.length + " != " + this.pRings.length + ")");

in case the previous statement is false:

verificatum-vjsc/src/js/verificatum/arithm/PPRing.js

Lines 275 to 279 in 85eae03

	if (value.length === this.pRings.length) {
	elements = value;
	} else {
	throw Error("Wrong number of elements! (" +
	elements.length + " != " + this.pRings.length + ")");

The elements variable is not yet defined, so elements.length would result in a TypeError.