[UX] Installer: more meaningful messages when db connection fails. #2739
Description
Describe your issue or idea
While setting up a fresh local environment on Windows, I got this error after clicking "Save and continue" at the "Choose language" step of the installer (1st step):
Fatal error: Call to a member function name() on boolean in C:\www\backdrop170\core\includes\install.core.inc on line 984
It turned out that I had not enabled the php_pdo_mysql extension in php.ini, but that error did not help me at all.
Steps to reproduce (if reporting a bug)
I guess try to run the installer with php_pdo_mysql extension disabled.
Actual behavior (if reporting a bug)
The error above.
Expected behavior (if reporting a bug)
A more meaningful error like "Could not establish database connection. php_pdo_mysql extension missing or not enabled`"