grab: move the initialization of pctx variable outside of if-else The pctx variable is used outside of the if-else but it was initialized under the conditional statements. Added test for the case when the initialization inside the if-else broke `hg grab --continue`.

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# utility to setup pythonpath to point into the tested repository

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export SRCDIR=`dirname $TESTDIR`

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if [ -n "$PYTHONPATH" ]; then

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    export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH

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    export PYTHONPATH=$SRCDIR:$PYTHONPATH

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else

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    export PYTHONPATH=$SRCDIR

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fi