fix: Handle empty prompt (using only template/inputs from providerOptions)

Author: jamesbaskerville

integrations/ai-sdk/src/convert-to-humanloop-chat-messages.ts

@@ -11,6 +11,11 @@ import { HumanloopChatPrompt } from './humanloop-api-types';
     const messages: HumanloopChatPrompt = [];
 
     for (const { role, content } of prompt) {
+      // Skip empty messages, i.e. when prompt == ""
+      if (content === "") {
+        continue;
+      }
+
       switch (role) {
         case 'system': {
           messages.push({ role: 'system', content });

integrations/ai-sdk/src/humanloop-chat-language-model.ts

@@ -97,7 +97,7 @@ export class HumanloopChatLanguageModel implements LanguageModelV1 {
         const { path, id, prompt: promptProviderMetadata, ...restProviderMetadata } = (providerMetadata?.humanloop as HumanloopProviderMetadata) ?? {};
 
         if (!path && !id) {
-            throw new Error("One of path or id is required in providerMetadata.humanloop.")
+            throw new Error("Either path or id is required in providerOptions.humanloop.")
         }
 
         // prompt hyperparameters: