Fix typecheck: guard against empty codec targetTypes in SQL provider

When skipping unresolvable codecs was introduced, the narrowing from
a non-null codec lookup no longer guaranteed targetTypes[0] was
defined under noUncheckedIndexedAccess. Skip descriptors whose codec
has no target types instead of assigning undefined to nativeType.

Author: wmadden

packages/2-sql/2-authoring/contract-psl/src/provider.ts

@@ -23,7 +23,9 @@ function buildColumnDescriptorMap(
   for (const [typeName, codecId] of scalarTypeDescriptors) {
     const codec = codecLookup.get(codecId);
     if (!codec) continue;
-    result.set(typeName, { codecId, nativeType: codec.targetTypes[0] });
+    const nativeType = codec.targetTypes[0];
+    if (nativeType === undefined) continue;
+    result.set(typeName, { codecId, nativeType });
   }
   return result;
 }