Allocate(0) id a free with blc_mem

src/blc_mem.cpp

@@ -38,10 +38,12 @@ void blc_mem::allocate(){
 }
 
 void blc_mem::allocate(size_t new_size){
+    
     if (new_size != size || data == NULL)  // Changement de taille ou l'allocation n'a encore jamais été faite
     {
-        free(data);
-        data = MANY_ALLOCATIONS(new_size, char);
+        if (data) free(data);
+        if (new_size) data = MANY_ALLOCATIONS(new_size, char);
+        else data=NULL;
         size = new_size;
     }
 }