model tags can be undefined (#107)

following #87

interfaces/Libraries.ts

@@ -68,7 +68,7 @@ predictor_input = {"passage": "My name is Wolfgang and I live in Berlin", "quest
 predictions = predictor.predict_json(predictor_input)`;
 
 const allennlp = (model: ModelData) => {
-	if (model.tags.includes("question-answering")){
+	if (model.tags?.includes("question-answering")){
 		return allennlpQuestionAnswering(model);
 	}
 	return allennlpUnknown();
@@ -100,9 +100,9 @@ const espnetUnknown = () =>
 `unknown model type (must be text-to-speech or automatic-speech-recognition)`;
 
 const espnet = (model: ModelData) => {
-	if (model.tags.includes("text-to-speech")){
+	if (model.tags?.includes("text-to-speech")){
 		return espnetTTS(model);
-	} else if (model.tags.includes("automatic-speech-recognition")) {
+	} else if (model.tags?.includes("automatic-speech-recognition")) {
 		return espnetASR(model);
 	}
 	return espnetUnknown();
@@ -147,9 +147,9 @@ model = TFAutoModel.from_pretrained("${model.modelId}")
 `;
 
 const tensorflowtts = (model: ModelData) => {
-	if (model.tags.includes("text-to-mel")){
+	if (model.tags?.includes("text-to-mel")){
 		return tensorflowttsTextToMel(model);
-	} else if (model.tags.includes("mel-to-wav")) {
+	} else if (model.tags?.includes("mel-to-wav")) {
 		return tensorflowttsMelToWav(model);
 	}
 	return tensorflowttsUnknown(model);