Switch the get_loop_elements implementation to only return populated arrays when its an array-like object.

src/renderer/parameters_context.rs

@@ -91,7 +91,7 @@ impl Loopable for ParametersContext {
         // TODO: Would this even ever be called? Won't matter, but I'd
         // like to know. Since it is injected 1 above the current
         // context, we wouldn't be able to access it with `{.}`.
-        vec![self]
+        Vec::new()
     }
 }
 
@@ -158,16 +158,7 @@ impl Renderable for OwnedLiteral {
 
 impl Loopable for OwnedLiteral {
     fn get_loop_elements(&self) -> Vec<&dyn ContextElement> {
-        match self {
-            OwnedLiteral::LString(text) => {
-                if text.is_empty() {
-                    Vec::new()
-                } else {
-                    vec![self]
-                }
-            }
-            OwnedLiteral::LPositiveInteger(num) => vec![self],
-        }
+        Vec::new()
     }
 }