chore: explicit error for no files in zephyr-image-update-module

Check if the aritfact has a payload file by adding a boolean that's set
when the download artifact flash callback is called.

Ticket: MEN-7804

Signed-off-by: Daniel Skinstad Drabitzius <[email protected]>

core/src/mender-zephyr-image-update-module.c

@@ -29,6 +29,8 @@
  */
 static void *mcu_boot_flash_handle = NULL;
 
+static bool artifact_has_payload;
+
 /**
  * @brief Callback function to be invoked to perform the treatment of the data from the artifact type "zephyr-image"
  * @return MENDER_OK if the function succeeds, error code if an error occurred
@@ -126,6 +128,7 @@ mender_zephyr_image_download_artifact_flash_callback(MENDER_NDEBUG_UNUSED mender
         }
     }
 
+    artifact_has_payload = true;
 END:
 
     return ret;
@@ -136,6 +139,12 @@ mender_zephyr_image_set_pending_image(MENDER_NDEBUG_UNUSED mender_update_state_t
     assert(MENDER_UPDATE_STATE_INSTALL == state);
     mender_err_t ret;
 
+    if (!artifact_has_payload) {
+        mender_log_error("No file in artifact");
+        return MENDER_FAIL;
+    }
+    artifact_has_payload = false;
+
     if (NULL == mcu_boot_flash_handle) {
         mender_log_error("Set pending image requested but handle is cleared");
         return MENDER_FAIL;
@@ -157,6 +166,7 @@ mender_zephyr_image_abort_deployment(MENDER_NDEBUG_UNUSED mender_update_state_t
         mender_log_error("Unable to abort deployment");
         return ret;
     }
+    artifact_has_payload = false;
     return MENDER_OK;
 }