[dsmr] Handle cosem values that a have a unit or not, related to smarty meters

[Hilbrand]

And some minor cleanup fixes.

[TravisBuddy]

Travis tests were successful

Hey @Hilbrand,
we found no major flaws with your code. Still you might want to look at this logfile, as we usually suggest some optional improvements.

[TravisBuddy]

Travis tests were successful

Hey @Hilbrand,
we found no major flaws with your code. Still you might want to look at this logfile, as we usually suggest some optional improvements.

[wborn]

This PR seems to have broken the build now that Spotless is enabled:

[ERROR] Failed to execute goal com.diffplug.spotless:spotless-maven-plugin:2.0.3:check (codestyle_check) on project org.openhab.binding.dsmr: The following files had format violations:
[ERROR]     src/main/java/org/openhab/binding/dsmr/internal/device/SmartyDecrypter.java
[ERROR]         @@ -192,7 +192,7 @@
[ERROR]          ········reset();
[ERROR]          ········if·(plainText·==·null)·{
[ERROR]          ············telegramListener
[ERROR]         -············.telegramReceived(new·P1Telegram(Collections.emptyList(),·TelegramState.INVALID_ENCRYPTION_KEY));
[ERROR]         +····················.telegramReceived(new·P1Telegram(Collections.emptyList(),·TelegramState.INVALID_ENCRYPTION_KEY));
[ERROR]          ········}·else·{
[ERROR]          ············parser.parse(plainText,·plainText.length);
[ERROR]          ········}

[wborn]

It was to be expected so I'll trigger some builds on recent PRs to reduce the chance of it happening again. 😉