Fix issue with multiple children in main branch of if statement

spec/match_spec.cr

@@ -22,7 +22,7 @@ describe Template do
     tpl.matches?("false").should eq false
   end
 
-  it "should match unless statement", tags: "current" do
+  it "should match unless statement" do
     tpl = Parser.parse("{% unless var == true %}false{% endif %}")
 
     tpl.matches?("false").should eq true
@@ -89,4 +89,12 @@ describe Template do
     tpl.matches?("even odd even ").should eq true
     tpl.matches?("even noteven even").should eq false
   end
+
+  it "should match nested if statement", tags: "current" do
+    tpl = Parser.parse("{% if count %}Count: {% for x in 1..3 %}N{{ x }}{% endfor %}{% else %}Reverse Count: {% for x in 9..7 %}R{{ x }}{% endfor %}{% endif %}")
+
+    tpl.matches?("Count: N1N2N3").should eq true
+    tpl.matches?("Reverse Count: R9R8R7").should eq true
+    tpl.matches?("").should eq false
+  end
 end

src/liquid/match_visitor.cr

@@ -15,7 +15,7 @@ module Liquid
     end
 
     def visit(node : Conditional) : String
-      child_nodes = node.children.map { |e| self.visit e }
+      child_nodes = [node.children.map { |e| self.visit e }.join]
 
       if elsif_arr = node.elsif
         elsif_arr.each do |alt|