Add parsing for conditionals (cont.)

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

src/ast/snapshots/nomo__ast__tests__check_invalid_action.snap

@@ -0,0 +1,30 @@
+---
+source: src/ast/mod.rs
+expression: ast.to_report(input)
+---
+error: Standlone action block
+  ╭▸ 
+1 │ {{ value }}
+  │    ━━━━━
+  │
+  ╰ help: If you want to output this expression, add a '=' to the block
+error: Standlone action block
+  ╭▸ 
+2 │         {{ value }}
+  │            ━━━━━
+  ╰ help: If you want to output this expression, add a '=' to the block
+error: Standlone action block
+  ╭▸ 
+3 │         {{ value }}
+  │            ━━━━━
+  ╰ help: If you want to output this expression, add a '=' to the block
+error: Standlone action block
+  ╭▸ 
+4 │         {{ value }}
+  │            ━━━━━
+  ╰ help: If you want to output this expression, add a '=' to the block
+error: Standlone action block
+  ╭▸ 
+5 │         {{ value }}
+  │            ━━━━━
+  ╰ help: If you want to output this expression, add a '=' to the block