Add proper exception instead of an NPE upon unsafe initialization

[utybo]

Example of an exception occurring because of an unsafe exception in the constructor of a component:

Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Map.get(Object)" because the return value of "guru.zoroark.tegral.di.environment.MixedImmutableEnvironment.access$getComponents$p(guru.zoroark.tegral.di.environment.MixedImmutableEnvironment)" is null
	at guru.zoroark.tegral.di.environment.MixedImmutableEnvironment$MIEInjector$getValue$1.invoke(MixedImmutableEnvironment.kt:66)
	at guru.zoroark.tegral.di.DynLazy.getOrInitialize(DynLazy.kt:37)
	at guru.zoroark.tegral.di.environment.MixedImmutableEnvironment$MIEInjector.getValue(MixedImmutableEnvironment.kt:65)
	at org.epilink.bot.http.HttpServerImpl.getWsCfg(HttpServer.kt:38)
	at org.epilink.bot.http.HttpServerImpl.<init>(HttpServer.kt:47)
	... 32 more

Also, docs about the safeInjection() failure is incorrect: unsafe injections never work now