emopers opened a new pull request #103: The TreeBuilder constructor does not check the validity of the input String s URL: https://github.com/apache/commons-math/pull/103 The `TreeBuilder` constructor does not check whether the input string `s` is null before constructing a `StringTokenizer`. This will cause a `NullPointerException` to be thrown according to the [docs](https://docs.oracle.com/javase/7/docs/api/java/util/StringTokenizer.html#StringTokenizer(java.lang.String)). It also does not check whether `s` is empty. This will cause a NoSuchElementException to be thrown when nextToken() is called according to the [docs](https://docs.oracle.com/javase/7/docs/api/java/util/StringTokenizer.html#nextToken()). This pull request adds a check to the String `s` and throws a ParseException if `s` is null or empty. It also adds two tests.
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