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AbstractConfiguration.java calls java.lang.Short.parseShort without first checking whether the argument parses.
This lead to an uncaught NumberFormatException: Oracle Java 7 API specification.

This pull request adds a check with a more helpful exception message and tests for this issue.

• missing/exception_handling

org/trendafilov/confucius/core/AbstractConfiguration.java

getShortValue(String, short)

class AbstractConfiguration {
	public synchronized short getShortValue(String key, short defaultValue) {
		String value = System.getProperty(key);
		return value == null ? defaultValue : Short.parseShort(value);
	}

}