CCException when return type of createInterceptors function is an array type

[dilanSachi]

Description:
Refer the following sample.

listener http:Listener interceptorListener = new (9090);

service http:InterceptableService / on interceptorListener {

    public function createInterceptors() returns http:Interceptor[] {
        return [new RequestInterceptor()];
    }
    resource function get albums() returns Album[] {
        return albums.toArray();
    }
}

This results with,

error: interceptor service registration failed: class io.ballerina.runtime.internal.types.BNullType cannot be cast to class io.ballerina.runtime.api.types.ObjectType (io.ballerina.runtime.internal.types.BNullType and io.ballerina.runtime.api.types.ObjectType are in unnamed module of loader 'app')