RangeError thrown when calling toCurrencyFormat() with value without period and mantissaLength = 0

[EstebanCardenas]

Whenever a value without period is sent and the mantissaLength prop is set to 0, a RangeError is thrown.

Example:

toCurrencyString('2545', mantissaLength: 0)

Expected:

2,545

Instead RangeError is thrown.

This is because line 565 returns -1 since there are no periods in the value, and then line 566 attempts to take a substring from 0 to -1.

[caseyryan]

Thanks. Fixed