Tests

fix: only add observed equations to affect system if there are algebraic equations in the system #2733

Job	Run time
Tests (1, Extended) / Tests - Extended	1m 32s
Tests (1, Downstream) / Tests - Downstream	1m 34s
Tests (1, FMI) / Tests - FMI	1m 34s
Tests (lts, FMI) / Tests - FMI	1m 30s
Tests (lts, InterfaceI) / Tests - InterfaceI	1m 35s
Tests (lts, Extended) / Tests - Extended	1m 29s
Tests (1, Extensions) / Tests - Extensions	1m 34s
Tests (lts, Initialization) / Tests - Initialization	1m 29s
Tests (pre, Extended) / Tests - Extended	1m 34s
Tests (pre, RegressionI) / Tests - RegressionI	1m 36s
Tests (pre, Extensions) / Tests - Extensions	1m 35s
Tests (1, InterfaceI) / Tests - InterfaceI	1m 35s
Tests (pre, FMI) / Tests - FMI	1m 34s
Tests (1, RegressionI) / Tests - RegressionI	1m 38s
Tests (lts, InterfaceII) / Tests - InterfaceII	1m 28s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	1m 31s
Tests (lts, Downstream) / Tests - Downstream	1m 32s
Tests (lts, RegressionI) / Tests - RegressionI	1m 31s
Tests (pre, Initialization) / Tests - Initialization	1m 38s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	1m 39s
Tests (pre, InterfaceI) / Tests - InterfaceI	1m 37s
Tests (lts, Extensions) / Tests - Extensions	1m 29s
Tests (pre, Downstream) / Tests - Downstream	1m 33s
Tests (pre, InterfaceII) / Tests - InterfaceII	1m 32s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	1m 32s
Tests (1, InterfaceII) / Tests - InterfaceII	1m 35s
Tests (1, Initialization) / Tests - Initialization	1m 32s
	41m 58s

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