android-info.txt: do not output 'board=' if no board_name

If no board name, output nothing to the android-info.txt.
Currently the output of 'board=' might trigger some parsing error
on some clients.

Bug: 189990989
Test: make out/target/product/generic_arm64/android-info.txt
Change-Id: Ia9aab6c092c07349aa57f0e73f8c69b6e05874c1

parent 041770b5

target/board/Android.mk

+3 −1

Original line number	Diff line number	Diff line
		@@ -24,8 +24,10 @@ $(INSTALLED_ANDROID_INFO_TXT_TARGET): $(board_info_txt) build/make/tools/check_r
		$(call pretty,"Generated: ($@)")
		ifdef board_info_txt
		$(hide) grep -v '#' $< > $@
		else
		else ifdef TARGET_BOOTLOADER_BOARD_NAME
		$(hide) echo "board=$(TARGET_BOOTLOADER_BOARD_NAME)" > $@
		else
		$(hide) echo "" > $@
		endif

		# Copy compatibility metadata to the device.