fix bug 9100

object and package containers may have multiple entries

(manually backported 30239117ac1364b03a0a000cb79f91d986a3aa60 from master)

Change-Id: If589988795f5307dccc8106f886cb115228efad4
Reviewed-on: https://code.wireshark.org/review/3123
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>
Tested-by: Martin Kaiser <wireshark@kaiser.cx>