Fix regression when a rule has no docs

[hipstersmoothie]

This fixes a regression introduced by https://github.com/sindresorhus/eslint-formatter-pretty/pull/48/files

Previously rules without docs would produce an error that was ignored:

try {
  ruleUrl = getRuleDocs(x.ruleId).url;
} catch (_) {}

this was changed to

try {
  ruleUrl = data.rulesMeta[x.ruleId].docs.url;
} catch (_) {
  ruleUrl = getRuleDocs(x.ruleId).url;
}

(notice that the error is no longer caught)

My change matches the original behavior and catches the error

try {
	ruleUrl = data.rulesMeta[x.ruleId].docs.url;
} catch (_) {
	try {
		ruleUrl = getRuleDocs(x.ruleId).url;
	} catch (_) {}
}

[sindresorhus]

Good catch :)