Remove redundant nil check (#2194)

From the Go docs:

  "If the map is nil, the number of iterations is 0." [1]

Therefore, an additional nil check for before the loop is unnecessary.

[1]: https://go.dev/ref/spec#For_range

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

view/jet.go

@@ -282,10 +282,8 @@ func (s *JetEngine) initSet() {
 		}
 
 		s.Set = jet.NewSet(s.loader, opts...)
-		if s.vars != nil {
-			for key, value := range s.vars {
-				s.Set.AddGlobal(key, value)
-			}
+		for key, value := range s.vars {
+			s.Set.AddGlobal(key, value)
 		}
 	}
 	s.mu.Unlock()