Revert "syntax: Remove empty rules in regions"

This reverts commit a9b513a28a.

runtime/syntax/pascal.yaml

@@ -12,6 +12,7 @@ rules:
     - special:
         start: "asm"
         end: "end"
+        rules: []
     - constant.number: "\\$[0-9A-Fa-f]+"
     - constant.number: "\\b[+-]?[0-9]+([.]?[0-9]+)?(?i:e[+-]?[0-9]+)?"
     - constant.string:
@@ -28,13 +29,17 @@ rules:
     - preproc:
         start: "{\\$"
         end: "}"
+        rules: []
     - comment:
         start: "//"
         end: "$"
+        rules: []
     - comment:
         start: "\\(\\*"
         end: "\\*\\)"
+        rules: []
     - comment:
         start: "({)(?:[^$])"
         end: "}"
+        rules: []