Fix error handling in rp2xxx pio assembler (#346) #70

Job	Run time
Unit Test Regz (ubuntu-latest)	17s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	17s
Unit Test Regz (windows-latest)	2m 6s
Unit Test Regz (macos-latest)	30s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	31s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	21s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 16s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 45s
Build Examples (espressif/esp)	2m 16s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 23s
Build Examples (gigadevice/gd32)	2m 19s
Unit Test Ports (macos-latest, gigadevice/gd32)	27s
Build Examples (microchip/avr)	2m 10s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	35s
Build Examples (microchip/atsam)	2m 3s
Unit Test Ports (macos-latest, stmicro/stm32)	28s
Build Examples (nordic/nrf5x)	2m 6s
Build Examples (nxp/lpc)	2m 6s
Build Website	20s
Build Examples (stmicro/stm32)	26s
Build Examples (raspberrypi/rp2xxx)	2m 28s
Dry Run Packaging	1m 32s
Build Examples (wch/ch32v)	2m 18s
Check that stm32 generated code is up to date	38s
Unit Test UF2 (ubuntu-latest)	14s
Unit Test UF2 (windows-latest)	1m 54s
Unit Test UF2 (macos-latest)	48s
	33m 34s

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