Indicate failure if array element can't get decoded

Author: krzyzanowskim

Sources/LanguageServerProtocol/SupportTypes/LSPAny.swift

@@ -159,30 +159,42 @@ extension Array: LSPAnyCodable where Element: LSPAnyCodable {
       case .dictionary(let dict):
         if let value = Element(fromLSPDictionary: dict) {
           result.append(value)
+        } else {
+          return nil
         }
       case .array(let value):
         if let value = value as? [Element] {
           result.append(contentsOf: value)
+        } else {
+          return nil
         }
       case .string(let value):
         if let value = value as? Element {
           result.append(value)
+        } else {
+          return nil
         }
       case .int(let value):
         if let value = value as? Element {
           result.append(value)
+        } else {
+          return nil
         }
       case .double(let value):
         if let value = value as? Element {
           result.append(value)
+        } else {
+          return nil
         }
       case .bool(let value):
         if let value = value as? Element {
           result.append(value)
+        } else {
+          return nil
         }
       case .null:
-        // skip array of null
-        break
+        // null is not expected for non-optional Element
+        return nil
       }
     }
     self = result