Start fixing error outputs

Signed-off-by: Marcel Müller <neikos@neikos.email>

tests/errors/invalid_if.1-parsed.snap

@@ -0,0 +1,24 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+info:
+  input: "{{ if if }} {{ end }}"
+  context: {}
+---
+ParsedTemplate {
+    tokens: [
+        [LeftDelim]"{{" (0..2),
+        [Whitespace]" " (2..3),
+        [ConditionalIf]"if" (3..5),
+        [Whitespace]" " (5..6),
+        [ConditionalIf]"if" (6..8),
+        [Whitespace]" " (8..9),
+        [RightDelim]"}}" (9..11),
+        [Whitespace]" " (11..12),
+        [LeftDelim]"{{" (12..14),
+        [Whitespace]" " (14..15),
+        [End]"end" (15..18),
+        [Whitespace]" " (18..19),
+        [RightDelim]"}}" (19..21),
+    ],
+}