chore(cli): remove bang operator and fix eslint warning (#4648)

packages/cli/cli/versions.yml

@@ -1,3 +1,9 @@
+- changelogEntry:
+  - summary: Remove bang operator and fix eslint warning in `compatible-ir-versions.ts`. 
+    type: internal
+  irVersion: 53
+  version: 0.41.14-rc2
+
 - changelogEntry:
   - summary: |
       Running `fern check` will now check to confirm that the generator versions you are running are compatible with your Fern CLI version.

packages/cli/fern-definition/validator/src/rules/compatible-ir-versions/compatible-ir-versions.ts

@@ -32,12 +32,11 @@ async function getIrVersionForGeneratorInvocation(
         dockerImage: invocation.name
     });
     // Again, this is to allow for offline usage, and other transient errors
-    if (!generatorEntity.ok) {
+    if (!generatorEntity.ok || generatorEntity.body == null) {
         return undefined;
     }
     const generatorRelease = await fdr.generators.versions.getGeneratorRelease(
-        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-        generatorEntity.body!.id,
+        generatorEntity.body.id,
         invocation.version
     );