Geohasher.decode throws ArrayIndexOutOfBoundsException for long inputs

[JavadocMD]

Geohasher throws an exception when decoding a hash of more than 12 characters (with default configuration). This should instead silently truncate to the number of characters allowed for the configured precision.

Geohasher.decode("spuxq0mctb6uz"); // throws java.lang.ArrayIndexOutOfBoundsException

[JavadocMD]

Another poorly-handled edge-case:

Geohasher.decode(""); // throws java.lang.ArrayIndexOutOfBoundsException