Add minLength constraint to ImportantFilePatterns schema items

Author: MariusStorhaug

src/Settings.schema.json

@@ -13,7 +13,8 @@
       "type": "array",
       "description": "Regex patterns that identify important files. Changes matching these patterns trigger build, test, and publish stages. Defaults to ['^src/', '^README\\.md$'] when not configured.",
       "items": {
-        "type": "string"
+        "type": "string",
+        "minLength": 1
       }
     },
     "Test": {