Collector: machine number identifies the machine, not the PC; ntlars empty-value fix

plugins/backups/services/ntlars.py

@@ -149,6 +149,13 @@ def _parsevalue(body):
         return _parsehexvalue(body)
     if body == '-':
         return 'DELETE', None
+    if body == '':
+        # "Name="  with nothing after the sign. Not strictly legal, but it
+        # occurs in real exports (the part marker's WJPRT.reg has KRelay1 like
+        # this), and failing the whole file over it would mean that machine can
+        # never be backed up. Treat it as an empty string so the value NAME is
+        # still preserved.
+        return 'REG_SZ', ''
     raise NtlarsParseError('unrecognised value form: {!r}'.format(body))