logs_event_pairs: Don't require matching start

Author: jpsamaroo

src/utils/logging.jl

@@ -121,7 +121,7 @@ function logs_event_pairs(f, logs::Dict)
             event_key = (category, id)
             if kind == :start
                 running_events[event_key] = idx
-            else
+            elseif haskey(running_events, event_key)
                 event_start_idx = running_events[event_key]
                 f(w, event_start_idx, idx)
             end