Tests

fix change of var for sys with no equations #1909

Job	Run time
Tests (1, InterfaceI) / Tests - InterfaceI	45m 48s
Tests (lts, InterfaceII) / Tests - InterfaceII	53m 6s
Tests (pre, Extended) / Tests - Extended	14m 46s
Tests (1, Extensions) / Tests - Extensions	44m 33s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 54s
Tests (lts, RegressionI) / Tests - RegressionI	8m 29s
Tests (1, RegressionI) / Tests - RegressionI	15m 56s
Tests (lts, Downstream) / Tests - Downstream	16m 55s
Tests (lts, Extended) / Tests - Extended	11m 0s
Tests (lts, Extensions) / Tests - Extensions	29m 37s
Tests (lts, FMI) / Tests - FMI	17m 28s
Tests (1, Initialization) / Tests - Initialization	33m 27s
Tests (pre, RegressionI) / Tests - RegressionI	14m 33s
Tests (pre, InterfaceI) / Tests - InterfaceI	14m 36s
Tests (pre, Extensions) / Tests - Extensions	14m 28s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	20m 43s
Tests (1, Extended) / Tests - Extended	19m 8s
Tests (lts, InterfaceI) / Tests - InterfaceI	31m 45s
Tests (1, Downstream) / Tests - Downstream	25m 55s
Tests (1, FMI) / Tests - FMI	25m 13s
Tests (pre, InterfaceII) / Tests - InterfaceII	14m 45s
Tests (1, InterfaceII) / Tests - InterfaceII	54m 39s
Tests (pre, Initialization) / Tests - Initialization	14m 38s
Tests (lts, Initialization) / Tests - Initialization	22m 23s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	14m 43s
Tests (pre, Downstream) / Tests - Downstream	14m 51s
Tests (pre, FMI) / Tests - FMI	14m 54s
	10h 20m 13s

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