fix possible issue in particle injection

src/modules/moduleInject.f90

@@ -156,6 +156,7 @@ MODULE moduleInject
 
       !Calculates cumulative probability
       ALLOCATE(self%cumWeight(1:self%nEdges))
+      et = 1
       self%cumWeight(1) = mesh%edges(self%edges(et))%obj%weight
       DO et = 2, self%nEdges
         self%cumWeight(et) = mesh%edges(self%edges(et))%obj%weight + self%cumWeight(et-1)