Fixes the infinite-loop-on-eof problem (more proper fix) #1270
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This fixes #1266 by checking for success/failure right after doing the getline. The existing checks for kw are conditioned on getline returning success.
This is a more proper fix than #1267 but it changes indentation so it looks like a big change; if you do a git diff -b you’ll see that only 1 line is changed and 3 lines added.