Fix the bug in StrippingBc2Ds2MuMuLine

Niladri Sahoorequested to merge
RD_Bc2Ds2MuMuLine_2018-patches into RD_2018-patches

Fixed the bug from the last commit (in !1799 (merged)) which was giving error while testing the lines by RD liaisons.

Edited by Niladri Sahoo

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