ConversionException: Zero length BigInteger
-------------------------------------------

                 Key: JXPATH-82
                 URL: https://issues.apache.org/jira/browse/JXPATH-82
             Project: Commons JXPath
          Issue Type: Bug
    Affects Versions: 1.2 Final
            Reporter: Sergey Vladimirov
            Priority: Minor


When JXPath is lenient and asked to return typized value by
...getValue(..., BigInteger.class)

it should return NULL value, instead of throwing

Caused by: org.apache.commons.beanutils.ConversionException: Zero length 
BigInteger
        at 
org.apache.commons.beanutils.converters.BigIntegerConverter.convert(BigIntegerConverter.java:117)
        at 
org.apache.commons.jxpath.util.BasicTypeConverter.convert(BasicTypeConverter.java:299)
        at org.apache.commons.jxpath.util.TypeUtils.convert(TypeUtils.java:54)
        at 
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(JXPathContextReferenceImpl.java:373)
        at 
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(JXPathContextReferenceImpl.java:358)
        ... 12 more
Caused by: java.lang.NumberFormatException: Zero length BigInteger
        at java.math.BigInteger.<init>(BigInteger.java:275)
        at java.math.BigInteger.<init>(BigInteger.java:447)
        at 
org.apache.commons.beanutils.converters.BigIntegerConverter.convert(BigIntegerConverter.java:112)
        ... 16 more

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