Update Reshape::forwardDType().

include/aidge/operator/Reshape.hpp

@@ -122,6 +122,7 @@ public:
 
     /**
      * @brief Forward the data type.
+     * Output datatype is the same as input 0.
      * @return True if successful, false otherwise.
      */
     bool forwardDType() override final;

src/operator/Reshape.cpp

@@ -60,7 +60,10 @@ bool Aidge::Reshape_Op::dimsForwarded() const {
     return OperatorTensor::dimsForwarded();
 }
 bool Aidge::Reshape_Op::forwardDType(){
-    if (inputsAssociated()) {
+    // Note: Override required because shape input is an optional data.
+    // Meaning default implementation will fail since:
+    // input[0] dtype != input[1] dtype.
+    if (inputsAssociated(false)) {
         mOutputs[0]->setDataType(getInput(0)->dataType());
         return true;
     }