use try block in disable_polyester_threads

Author: Krastanov

src/utility.jl

@@ -8,6 +8,9 @@ problem (in such cases it is best to multithread only at the outermost level).
 """
 function disable_polyester_threads(f::F) where {F}
     t, r = request_threads(num_threads())
-    f()
-    foreach(free_threads!, r)
+    try
+        f()
+    finally
+        foreach(free_threads!, r)
+    end
 end