A day after seven of the Aam Aadmi Party’s 10 MPs in Rajya Sabha defected to the BJP, the top leaders of the party met in the heart of the Capital — not at a political function, but to express solidarity with a senior colleague in her moment of deep personal loss. Seated in the front row at a solemn function to honour the memory of Prof Vijay Kumar Singh, the father of former Delhi Chief Minister Atishi, was AAP national convener Arvind Kejriwal and his wife Sunita, Kejriwal’s former ministerial colleagues Manish Sisodia , Satyender Jain, and Imran Hussain, and Rajya Sabha MP Sanjay Singh. Former Speaker of the Delhi Vidhan Sabha Ram Niwas Goel, AAP MLA Jarnail Singh, and former MLA Dilip Pandey were among the other AAP leaders present at the commemoration at Chinmaya Mission on Saturday. Professor Singh, a distinguished academic, Marxist theorist, and an outstanding scholar of Soviet and Russian history who taught at Delhi University for 35 years, passed away on April 17. He was 80.…