Ndiff Bug found and fixed

[dlucci () purdue edu]

Hi,
  My name is Derril Lucci.  I am a Senior in Computer Science at Purdue
University.  I found a bug in ndiff.  The bug is that it crashes if a file does
not exist.  It occurs at in the Scan.load_from_file method.  I have included the
corrected code. 

def load_fro_file(self, filename):
    ""Load a scan from the Nmap XML file with the given filename.""
    try:
       f = open(filename, "r")
       self.load(f)
       f.close()
    except IOError:
       print u'Could not open', filename, u'.'
       sys.exit(1)

Thank you,
  Derril Lucci

C:  (617)688-6188
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