RxJava2-Java6

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BlockingObservable and NbpBlockingObservable use Optional.stream()

3

While the implementation could probably be changed upstream as the steam is just convenience, this needs reconciled either way.

JakeWharton

``` Caused by: java.lang.NullPointerException at org.codehaus.mojo.animal_sniffer.SignatureChecker$CheckingVisitor.find(SignatureChecker.java:502) at org.codehaus.mojo.animal_sniffer.SignatureChecker$CheckingVisitor.access$900(SignatureChecker.java:280) at org.codehaus.mojo.animal_sniffer.SignatureChecker$CheckingVisitor$1.check(SignatureChecker.java:416) at org.codehaus.mojo.animal_sniffer.SignatureChecker$CheckingVisitor$1.visitMethodInsn(SignatureChecker.java:377) at org.objectweb.asm.ClassReader.readCode(ClassReader.java:1429) at org.objectweb.asm.ClassReader.readMethod(ClassReader.java:1017) at org.objectweb.asm.ClassReader.accept(ClassReader.java:693) at org.objectweb.asm.ClassReader.accept(ClassReader.java:506) at org.codehaus.mojo.animal_sniffer.SignatureChecker.process(SignatureChecker.java:195) at org.codehaus.mojo.animal_sniffer.ClassFileVisitor.processClassFile(ClassFileVisitor.java:176) at org.codehaus.mojo.animal_sniffer.ClassFileVisitor.process(ClassFileVisitor.java:101) at org.codehaus.mojo.animal_sniffer.ClassFileVisitor.process(ClassFileVisitor.java:81) at org.codehaus.mojo.animal_sniffer.ClassFileVisitor.processDirectory(ClassFileVisitor.java:119)...

JakeWharton