Here's the problem:
1. Org's link system unconditionally calls *all* link :store handlers
when you call `org-store-link`, and all :export handlers when you
export an Org file.
2. The org-pdftools package works by defining a custom pdf: link with
custom :store and :export handlers.
3. Those handlers do not perform error handling before using pdftool's
API.
4. pdf-tools fails loudly and ungracefully with a
"pdf-info-epdfinfo-program is not executable" error when its API is
used and epdfinfo isn't installed.
TL;DR org-pdftools effectively breaks storing/exporting in org-mode
until pdf-tools-install is executed to install epdfinfo. This is awful
UX, so let's suppress the error.
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