Ticky: Formatting of "non-void args" column is broken

This is what I see in Ticky profiles currently:

    Entries       Alloc     Alloc'd  Non-void Arguments                                              STG Name
--------------------------------------------------------------------------------
          1           0           0   1 {"type":"entCntr","subTy":"fun","fvs_c":0,"fvs":"","args":"S GHC.Event.EPoll.new4{v r3zk} (fun)
          2           0           0   1 {"type":"entCntr","subTy":"fun","fvs_c":0,"fvs":"","args":"E GHC.Event.Control.closeControl2{v r2WT} (fun)
          1           0           0   1 {"type":"entCntr","subTy":"fun","fvs_c":0,"fvs":"","args":"S GHC.Event.Poll.new2{v r3qR} (fun)

Note the truncated JSON output in the "Non-void Arguments" column. Surely there's something wrong here. I suspect that 75caafaa might be at fault (@mpickering), but I'm not completely sure.

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