warn for Rosenbrock methods with no differential variables #2157

Job	Run time
test (InterfaceI, 1)	22m 35s
test (InterfaceI, 1.6)	36m 24s
test (InterfaceII, 1)	19m 4s
test (InterfaceII, 1.6)	35m 18s
test (InterfaceIII, 1)	20m 45s
test (InterfaceIII, 1.6)	30m 34s
test (Integrators_I, 1)	25m 31s
test (Integrators_I, 1.6)	26m 8s
test (AlgConvergence_I, 1)	27m 29s
test (AlgConvergence_I, 1.6)	31m 35s
test (AlgConvergence_II, 1)	22m 50s
test (AlgConvergence_II, 1.6)	39m 31s
test (AlgConvergence_III, 1)	27m 11s
test (AlgConvergence_III, 1.6)	31m 4s
test (Downstream, 1)	15m 51s
test (Downstream, 1.6)	18m 48s
test (ODEInterfaceRegression, 1)	22m 17s
test (ODEInterfaceRegression, 1.6)	28m 22s
test (Multithreading, 1)	16m 21s
test (Multithreading, 1.6)	21m 21s
	8h 38m 59s

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