`implicitScope` can be `null`
in case when the implicit receiver resides in a user-defined `kotlin.*`
package, but the user have not yet allowed this with compiler argument
directive.
In this case,
we don't want the IDE to crush and show exceptions - the `kotlin`
package would be highlighted by the compiler diagnostics and other
resolve problems, and that would be enough
^KT-62071 Fixed
Roman Golyshev
3c68b27280