Import fails if document contains a mailto link

[colegleason]

When importing a quip document with a mailto link, the import fails on this line:

obsidian-quip/src/Importer.ts

Line 33 in fb38812

const secret_path = href.split('.com/', 2).at(1).split('/').at(0);

The trace is:

plugin:quip:1316 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'split')
    at Importer.process_A (plugin:quip:1316:55)
    at Importer.importHTML (plugin:quip:1345:18)
process_A @ plugin:quip:1316
importHTML @ plugin:quip:1345

Essentially the if statement is not correctly guarding against mailto links because the hostname of the URI is an empty string.

[voituk]

The fix is ready. Pull Request on it's way