Fix test regressions with SIGN=NONE

Author: danielinux

Makefile

@@ -447,8 +447,8 @@ test-app/image_v1_signed.bin: $(BOOT_IMG) keytools_check
 
 	$(Q)(test $(SIGN) = NONE) || $(SIGN_ENV) $(SIGN_TOOL) $(SIGN_OPTIONS) \
 		$(SECONDARY_SIGN_OPTIONS) $(BOOT_IMG) $(PRIVATE_KEY) \
-		$(SECONDARY_PRIVATE_KEY) 1
-	$(Q)(test $(SIGN) = NONE) && $(SIGN_ENV) $(SIGN_TOOL) $(SIGN_OPTIONS) $(BOOT_IMG) 1
+		$(SECONDARY_PRIVATE_KEY) 1 || true
+	$(Q)(test $(SIGN) = NONE) && $(SIGN_ENV) $(SIGN_TOOL) $(SIGN_OPTIONS) $(BOOT_IMG) 1 || true
 
 test-app/image.elf: wolfboot.elf
 	$(Q)$(MAKE) -C test-app WOLFBOOT_ROOT="$(WOLFBOOT_ROOT)" ELF_FLASH_SCATTER="$(ELF_FLASH_SCATTER)" image.elf