This class can be used when a proper {@link Format} cannot be found for someinput sources.
It implements the abstract method of {@link AbstractGridFormat} but it alwaysreturns null to indicate that the format it represents is unknown.
@author Jesse Eichar
@author Simone Giannecchini (simboss)
@source $URL$
@version $Revision: 1.9 $
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