Adds NOT_NULLPTR assertions to Function::enableTiming

23 jobs for mohr/timingTree in 35 minutes and 9 seconds (queued for 40 seconds)
latest
Name Stage Failure
failed
clang_10.0_mpionly_eigen_petsc_trilinos Pretest
hyteg                    = 504.47 sec*proc (232 tests)

Total Test time (real) = 494.05 sec

The following tests FAILED:
150 - VectorFunctionBasicTest (Failed)
Errors while running CTest
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
gcc_10_mpionly_dbg_sp Pretest
hyteg                    = 962.29 sec*proc (186 tests)

Total Test time (real) = 969.26 sec

The following tests FAILED:
110 - VectorFunctionBasicTest (Failed)
Errors while running CTest
Cleaning up file based variables
ERROR: Job failed: exit code 1