Signature file v2.1 reader for sigtest v1.3 cannot read static final String with value = "" in sig-file
bug reports:

   [java95] java.lang.Error: fld public static final <constant> <value=""> java.lang.String api.constants.Constants.s6
   [java95] at com.sun.tdk.signaturetest.FullItemDescription$Parser.err(FullItemDescription.java:1073)
   [java95] at com.sun.tdk.signaturetest.FullItemDescription$Parser.setupMemberName(FullItemDescription.java:962)
   [java95] at com.sun.tdk.signaturetest.FullItemDescription$Parser.parse(FullItemDescription.java:912)
   [java95] at com.sun.tdk.signaturetest.FullItemDescription.setData(FullItemDescription.java:416)
   [java95] at com.sun.tdk.signaturetest.FullItemDescription.parseDefinition(FullItemDescription.java:124)
   [java95] at com.sun.tdk.signaturetest.BasedClassDescription.<init>(BasedClassDescription.java:57)
   [java95] at com.sun.tdk.signaturetest.readers.SignatureClassLoader.nextClass(SignatureClassLoader.java:132)
   [java95] at com.sun.tdk.signaturetest.SignatureTest.check(SignatureTest.java:629)
   [java95] at com.sun.tdk.signaturetest.SignatureTest.run(SignatureTest.java:231)
   [java95] at com.sun.tdk.signaturetest.SignatureTest.main(SignatureTest.java:201)
   [java95] Error in signature file: file:sigfiles/constructors.sig
   [java95] STATUS:Error.Error in signature file: file:sigfiles/constructors.sig
   [java95] Java Result: 1