Prevent crashes when a line contains a splitter.

[hit-ybai]

Traceback (most recent call last): File "example/common/case.py", line 154, in cli() File "~/.local/lib/python2.7/site-packages/click/core.py", line 829, in call return self.main(*args, **kwargs) File "~/.local/lib/python2.7/site-packages/click/core.py", line 782, in main rv = self.invoke(ctx) File "~/.local/lib/python2.7/site-packages/click/core.py", line 1259, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "~/.local/lib/python2.7/site-packages/click/core.py", line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File "~/.local/lib/python2.7/site-packages/click/core.py", line 610, in invoke return callback(*args, **kwargs) File "example/common/case.py", line 94, in run full_dataset.parse() File "~/havenask/hape/hape_libs/utils/havenask_dataset.py", line 69, in parse key, value = line.split(self.kv_sep) ValueError: too many values to unpack

[CLAassistant]

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