Is one to have a Seudas Havrah on Chol Hamoed after the body was buried?

Yes.[1] However one does not serve the mourners the accustomed foods of mourning for this meal, such as eggs or lentils, and rather regular foods, such as coffee and cake/Matzah, are to be served.[2] Some[3] say that the mourners are to be served meat and wine. Some Poskim[4] rule that there is no prohibition for the mourners to eat their own food for the Seudas Havrah and thus they do not have to be fed by others. Nevertheless it is proper for others to give them food for this meal.

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[1] Michaber 547:8 “One performs Havrah on Chol Hamoed”

Other opinions: Some Poskim rule that one does not perform a Seudas Havrah on Chol Hamoed. [See Mahariy Bruna 181; Zera Emes 2:156; Kaf Hachaim 547:35]

[2] Zera Emes 2:156; Kaf Hachaim 547:35; Daas Torah 547; Gesher Hachaim 20:2-10; Piskeiy Teshuvos 548:5

[3] Matzeivas Moshe 2 [of Chochmas Adam]

[4] Igros Moshe Yoreh Deah 2:168; Chol Hamoed Kehilchasa 12:25