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tpl: Last now accepts 0 as limit

Modified the if conditional because of which last threw an error if 0 was passed as limit. The function now returns an empty slice if it is called with 0 as limit. The behavior of first and last is now the same when 0 is passed as limit. Also added tests to test the new behavior.

Fixes #6419

--- a/tpl/collections/collections.go

+++ b/tpl/collections/collections.go

@@ -378,7 +378,7 @@

 		return nil, err

 	}

-	if limitv < 1 {

+	if limitv < 0 {

 		return nil, errors.New("can't return negative/empty count of items from sequence")

 	}

--- a/tpl/collections/collections_test.go

+++ b/tpl/collections/collections_test.go

@@ -495,6 +495,8 @@

 		{int64(2), []int{100, 200, 300}, []int{200, 300}},

 		{100, []int{100, 200}, []int{100, 200}},

 		{"1", []int{100, 200, 300}, []int{300}},

+		{"0", []int{100, 200, 300}, []int{}},

+		{"0", []string{"a", "b", "c"}, []string{}},

 		// errors

 		{int64(-1), []int{100, 200, 300}, false},

 		{"noint", []int{100, 200, 300}, false},

-- 

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