VHS-Decode crash on empty video track

[Zcooger]

Issue applies to the tapes where video signal framing disappears but the carrier signal and head switch are still present.

file frame 968 unknown
file frame 968 unknown
ERROR:root:Extreme VSYNC-area corruption detected, dropping field
ERROR:root:Unable to determine start of field - dropping field
ERROR:root:Extreme VSYNC-area corruption detected, dropping field
ERROR:root:Unable to determine start of field - dropping field
ERROR:root:Extreme VSYNC-area corruption detected, dropping field
ERROR:root:Unable to determine start of field - dropping field
ERROR - please paste the following into a bug report:
current sample:  1553108106.43
arguments:  Namespace(cxadc=False, cxadc3=True, infile='/media/veracrypt1/gnuradio.r8', length=110000, ntsc=False, ntscj=False, othertrack=False, outfile='/media/veracrypt1/gnuradio1', pal=True, seek=-1, start=0)
Exception:  'int' object has no attribute 'append'  Traceback:
  File "./vhs-decode", line 111, in <module>
    f = vhsd.readfield()
  File "/home/zcooger/Desktop/vhs-decode/lddecode/core.py", line 2698, in readfield
    f, offset = self.decodefield(initphase = initphase)
  File "/home/zcooger/Desktop/vhs-decode/lddecode/core.py", line 2676, in decodefield
    self.internalerrors.append(e)

gnuradio-capture1082-1107_2291x625_25Hz_8bit.r8.7z.zip