Organizing imports in module-info.java removes all imports

[fbricon]

(Initially reported as redhat-developer/vscode-java#430)

After organizing imports on module-info-java (Shift+Alt+o), this:

import java.sql.Driver;

module mymodule {
	requires java.sql;
	provides Driver with mypackage.MyDriver;
}

becomes

module mymodule {
	requires java.sql;
	provides Driver with mypackage.MyDriver;
}

and the file fails to compile because of the unknown Driver type. It's very annoying when organize imports is triggered on save.