Fixed incorrect result of canHandleStatic for multi-objective formulas for MDP in hybrid engine and MA in sparse engine.

src/storm/modelchecker/csl/SparseMarkovAutomatonCslModelChecker.cpp

@@ -42,6 +42,7 @@ namespace storm {
                 if (requiresSingleInitialState) {
                     *requiresSingleInitialState = true;
                 }
+                return true;
             }
             return false;
         }

src/storm/modelchecker/prctl/HybridMdpPrctlModelChecker.cpp

@@ -46,6 +46,7 @@ namespace storm {
                 if (requiresSingleInitialState) {
                     *requiresSingleInitialState = true;
                 }
+                return true;
             }
             return false;
         }