Fixed history poisoning on empty tool response

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@ztimson/ai-utils",
-	"version": "1.2.10",
+	"version": "1.2.11",
 	"description": "AI Utility library",
 	"author": "Zak Timson",
 	"license": "MIT",

src/open-ai.ts

@@ -29,11 +29,11 @@ export class OpenAi extends LLMProvider {
 				}));
 				history.splice(i, 1, ...tools);
 				i += tools.length - 1;
-			} else if(h.role === 'tool' && h.content) {
+			} else if(h.role === 'tool') {
 				const record = history.find(h2 => h.tool_call_id == h2.id);
 				if(record) {
-					if(h.content.includes('"error":')) record.error = h.content;
-					else record.content = h.content;
+					if(h.content?.includes('"error":')) record.error = h.content;
+					else record.content = h.content || '';
 				}
 				history.splice(i, 1);
 				i--;