Lack of `fi` resulted in a syntax error.
Also, change `;` to `||` to ensure it builds successfully on architectures other than `linux/arm/v7`.
```
[2023-10-24T10:46:49.941Z] ------
> [dev_container_auto_added_stage_label 11/18] RUN mkdir -p "/home/archivebox/.config/chromium/Crash Reports/pending/" && chown -R archivebox "/home/archivebox/.config" ; if [[ "linux/amd64" == "linux/arm/v7" ]]; then $exit 0; else exit 1:
0.401 /bin/bash: -c: line 2: syntax error: unexpected end of file
------
WARNING: buildx: git was not found in the system. Current commit information was not captured by the build
[2023-10-24T10:46:49.942Z] Dockerfile-with-features:135
--------------------
134 | && ln -s "$CHROME_BINARY" /usr/bin/chromium-browser
135 | >>> RUN mkdir -p "/home/${ARCHIVEBOX_USER}/.config/chromium/Crash Reports/pending/" \
136 | >>> && chown -R $ARCHIVEBOX_USER "/home/${ARCHIVEBOX_USER}/.config" \
137 | >>> ; if [[ "$TARGETPLATFORM" == "linux/arm/v7" ]]; then $exit 0; else exit 1
138 | # ignore failure for architectures where no playwright release is available yet
--------------------
ERROR: failed to solve: process "/bin/bash -c mkdir -p \"/home/${ARCHIVEBOX_USER}/.config/chromium/Crash Reports/pending/\" && chown -R $ARCHIVEBOX_USER \"/home/${ARCHIVEBOX_USER}/.config\" ; if [[ \"$TARGETPLATFORM\" == \"linux/arm/v7\" ]]; then $exit 0; else exit 1" did not complete successfully: exit code: 2
```
Clean up error handling, and report a better error message
on search and flush if FTS5 tables haven't yet been created.
Add some mypy comments to clean up type-checking errors.
Use SQLite's FTS5 extension to power full-text search without any
additional dependencies. FTS5 was introduced in SQLite 3.9.0,
[released][1] in 2015 so should be available on most SQLite
installations at this point in time.
[1]: https://www.sqlite.org/changes.html#version_3_9_0
Add space after any close tag to ensure that
tokens that would be rendered separate in HTML
get extracted as separate tokens in text.
Example:
`<p>First</p><p>Second</p>` --> `First Second`
NOT `FirstSecond`
