DatabaseUtils: Revise getInt() to return Integer.MIN_VALUE

[sbabcoc]

Currently, the getInt() method returns -1 if no records were found, This is potentially a valid value. This should probably return something like Integer.MIN_VALUE instead.

[sbabcoc]

Upon further consideration, this should probably throw an IllegalStateException, as this should be considered an exceptional result. Same holds true for the getString() methods. Returning null isn't terribly informative, and potentially harmful to the client (i.e. - NullPointerException).