Fix Node::operator() that wrongly checked each input instead of data only

src/graph/Node.cpp

@@ -39,11 +39,15 @@ Aidge::Node::Node(std::shared_ptr<Operator> op, const std::string& name)
 
 Aidge::Connector Aidge::Node::operator()(const std::vector<Connector>& ctors) {
     assert((ctors.size() == nbData()) && "Wrong number of arguments.\n");
-    for (std::pair<std::shared_ptr<Node>, IOIndex_t>& input : inputs()) {
-        assert((gk_IODefaultIndex == input.second) &&
+    for (std::size_t i = 0; i < nbData(); i++) {
+        assert((gk_IODefaultIndex == input(i).second) &&
                "At least one input connection is not free.\n");
-        (void)input;  // avoid unused warning
     }
+    // for (std::pair<std::shared_ptr<Node>, IOIndex_t>& input : inputs()) {
+    //     assert((gk_IODefaultIndex == input.second) &&
+    //            "At least one input connection is not free.\n");
+    //     (void)input;  // avoid unused warning
+    // }
     IOIndex_t i = 0;
     for (const Connector& ctor : ctors) {
         if (ctor.node() != nullptr) {  // ctor must be associated with a node