[OpenJDK 2D-Dev] RFR: 8149560: TIFFField#createFromMetadataNode throws a NullPointerException when the node is set with "tagNumber" attribute

[Brian Burkhalter]

Please review at your convenience:

Issue:  https://bugs.openjdk.java.net/browse/JDK-8149560
Patch:  http://cr.openjdk.java.net/~bpb/8149560/webrev.00/

Summary:
1) Change the specification of createFromMetadataNode() to change the tag 
number attribute name from “tagNumber” to “number” in accord with the 
javax_imageio_tiff_image_1.0 native image metadata format specification.
2) Add a couple of @throws clauses to clarify exceptions which might ensure 
from a bad node parameter’s being passed in to createFromMetadataNode().

Thanks,

Brian