No exception when you pass isValid() digits

If isValid() were passed a string not starting with 'nla.obj-' it could conceivably return true.
If isValid() were passed a string not at least the length of 'nla.obj-' it would throw an exception.
This never happens...
undo unneeded new line
bumping version number to 1.1.26
Merge pull request #51 from nla/hr-unnecessaryPIUtilException

merged.