Typography field bug when switching Google Fonts with different weights

[hellor0bot]

Issue description:

For example I select Montserrat and 700 as font weight. Then I switch to another font, like Julius Sans One, which has only 400 weight. The weight field disappears, however the 700 weight remains in inline styles, making the new font bold.

Version used:

Develop branch.

Using theme_mods or options?

Theme mods.

[aristath]

Fixed.