Only unlet b:supertab_close_preview if it exists #183
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This change fixes a problem where Vim 7.3 would exit with a non-zero code when `g:SuperTabClosePreviewOnPopupClose` is 1. I see no reason why `b:supertab_close_preview` should be unlet silently if it has already been determined that it doesn't exist. In addition, I removed the `silent!` part since it is no longer needed.
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This change fixes a problem where Vim 7.3 would exit with a non-zero
code when
g:SuperTabClosePreviewOnPopupCloseis 1. I see no reasonwhy
b:supertab_close_previewshould be unlet silently if it hasalready been determined that it doesn't exist. In addition, I removed
the
silent!part since it is no longer needed.