return undefined explicitly to avoid compilation errors

(cherry picked from commit 228e549)

Author: Yuval Tal

src/templates/core/axios/getResponseHeader.hbs

@@ -1,9 +1,9 @@
-function getResponseHeader(response: AxiosResponse<any>, responseHeader?: string): string | undefined {
-    if (responseHeader) {
-        const content = response.headers[responseHeader];
-        if (isString(content)) {
-            return content;
-        }
-    }
-    return;
-}
+const getResponseHeader = (response: AxiosResponse<any>, responseHeader?: string): string | undefined => {
+	if (responseHeader) {
+		const content = response.headers[responseHeader];
+		if (isString(content)) {
+			return content;
+		}
+	}
+	return undefined;
+};

src/templates/core/functions/getFormData.hbs

@@ -20,7 +20,7 @@ function getFormData(options: ApiRequestOptions): FormData | undefined {
                 }
             });
 
-        return formData;
-    }
-    return;
-}
+		return formData;
+	}
+	return undefined;
+};