fix(02-01): add null check for search results to prevent crash

Add defensive null checks before calling .map() on data.results
in both the API route and provider implementation. Returns empty
array with success:true when results is undefined, preventing
"Cannot read properties of undefined (reading 'map')" crash.

Fixes: UAT-001 from 02-01-ISSUES.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/api/providers/replicate/models/route.ts

@@ -186,9 +186,25 @@ export async function GET(
 
     if (isSearchRequest) {
       const data: ReplicateSearchResponse = await response.json();
+      // Defensive null check - search API may return different structure
+      if (!data.results) {
+        console.log(`[Replicate:${requestId}] Search returned no results array`);
+        return NextResponse.json<ModelsSuccessResponse>({
+          success: true,
+          models: [],
+        });
+      }
       models = data.results.map((result) => mapToProviderModel(result.model));
     } else {
       const data: ReplicateModelsResponse = await response.json();
+      // Defensive null check for list endpoint as well
+      if (!data.results) {
+        console.log(`[Replicate:${requestId}] List returned no results array`);
+        return NextResponse.json<ModelsSuccessResponse>({
+          success: true,
+          models: [],
+        });
+      }
       models = data.results.map(mapToProviderModel);
     }
 

src/lib/providers/replicate.ts

@@ -161,6 +161,11 @@ const replicateProvider: ProviderInterface = {
       }
 
       const data: ReplicateModelsResponse = await response.json();
+      // Defensive null check - API may return different structure
+      if (!data.results) {
+        console.warn("[Replicate] List returned no results array");
+        return [];
+      }
       return data.results.map(mapToProviderModel);
     } catch (error) {
       console.error("[Replicate] Failed to list models:", error);
@@ -190,6 +195,11 @@ const replicateProvider: ProviderInterface = {
       }
 
       const data: ReplicateSearchResponse = await response.json();
+      // Defensive null check - search API may return different structure
+      if (!data.results) {
+        console.warn("[Replicate] Search returned no results array");
+        return [];
+      }
       return data.results.map((result) => mapToProviderModel(result.model));
     } catch (error) {
       console.error("[Replicate] Failed to search models:", error);