Resolve "Fix Problem::getState() and getState(ts)"

Closes #342 (closed)

include/core/state_block/has_state_blocks.h

@@ -301,9 +301,9 @@ inline VectorXd HasStateBlocks::getStateVector(const StateStructure& _sub_struct
     for (const char key : structure)
     {
         const auto& sb = getStateBlock(key);
-        if (!sb){
-            WOLF_ERROR("Stateblock key ", key, " not in the structure");
-        }
+
+        assert(sb != nullptr && "Requested StateBlock key not in the structure");
+
         state.segment(index,sb->getSize()) = sb->getState();
         index += sb->getSize();
     }