Log Message:
Update contao35 to 3.5.19.

Version 3.5.19 (2016-11-16)
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### Fixed
Only evaluate `hasDetails()` and `hasText()` upon the first call.

### Fixed
Cache the `PageModel::findPublishedFallbackByHostname()` results (see #8544).

### Fixed
Correctly redirect to the website root page (see #8552).

### Fixed
Continue rebuilding the search index if there are errors (see #8541).