fix: trace exception when deleting physical files

[ThePrez]

When deleting physical files (in particular those created with CRTPF, an unexpected failure may occur. Exception data in traces may resemble the following:

Received zero matches from listDirectoryDetails() against parent of /qsys.lib/abc.lib/MYFILE.FIL*
java.lang.Throwable
    at com.ibm.as400.access.Trace.logData(Trace.java:767)
    at com.ibm.as400.access.Trace.log(Trace.java:827)
    at com.ibm.as400.access.IFSFileImplRemote.isSymbolicLink(IFSFileImplRemote.java:1865)
    at com.ibm.as400.access.IFSFileImplRemote.delete(IFSFileImplRemote.java:516)
    at com.ibm.as400.access.IFSFile.delete0(IFSFile.java:851)
    at com.ibm.as400.access.IFSFile.delete(IFSFile.java:898)