* generic/tclBasic.c (Tcl_DeleteCommandFromToken): One consequence

        of the NRE rewrite is that there are now situations where a NULL
        objProc field in a Command struct is perfectly normal.  Removed an
        outdated comment in Tcl_DeleteCommandFromToken that claimed we
        use (cmdPtr->objPtr == NULL) as a test of command validity.  In fact
        we use (cmdPtr->flags & CMD_IS_DELETED) to perform that test.
        Also removed the setting to NULL, since any extension following the
        advice of the old comment is going to be broken by NRE anyway, and
        needs to shift to flag-based testing (or stop intruding into
        such internal matters).  Part of [Bug 2486550].

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