[GR-2798] Fixed max() on empty int vector.

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/Max.java

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/Min.java

.../src/com/oracle/truffle/r/nodes/builtin/base/PMinMax.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Range.java

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/Sum.java

...acle/truffle/r/nodes/unary/UnaryArithmeticReduceNode.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

...c/com/oracle/truffle/r/test/builtins/TestBuiltin_max.java

...c/com/oracle/truffle/r/test/builtins/TestBuiltin_min.java