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Description of problem:
issuing 'tar -f archive.tar --delete somefilename' removes files at the end of
the archive if the archive contains zero length files or symbolic links and
"somefilename" is not contained in the archive

Version-Release number of selected component (if applicable):
tar-1.13.25-4.7.1

How reproducible:
Always

Steps to Reproduce:
1. create a sample archive
dd if=/dev/zero of=file1 bs=1024 count=9 2>/dev/null
echo file2_contents >file2					
# Create empty file - that's the key. if no size 0 files (or symbolic links) 
# are in the archive, everything works as expected
# alternatively we could use 'ln -s file2 file3' here
touch file3

# Make sure the size 0 file is not at the end of the archive
dd if=/dev/zero of=file4 bs=1024 count=1 2>/dev/null
tar cf test.tar file1 file2 file3 file4

2. save the file listing 
tar tf test.tar > before

3. try to delete a file that doesn't exist in the archive (this corrupts the
archive)
tar --delete -f test.tar file_does_not_exist

4. save the file listing after corruption
tar tf test.tar > after

5. show the differences
diff before after


Actual Results:  file "before" and "after" differ

Expected Results:  file "before" and "after" should be identical

Additional info:

Bug can also be reproduced on 7.2 and phoebe