tweak to exception handling to reduce real cause vanishing.

Author: dghgit

tls/src/main/java/org/bouncycastle/jsse/provider/ProvX509TrustManager.java

@@ -7,6 +7,7 @@
 import java.security.Provider;
 import java.security.cert.CertPath;
 import java.security.cert.CertPathBuilder;
+import java.security.cert.CertPathBuilderException;
 import java.security.cert.CertSelector;
 import java.security.cert.CertStore;
 import java.security.cert.CertStoreParameters;
@@ -308,6 +309,14 @@ private X509Certificate[] validateChain(X509Certificate[] chain, String authType
 
             return trustedChain;
         }
+        catch (CertificateException e)
+        {
+            throw e;
+        }
+        catch (CertPathBuilderException e)
+        {
+            throw new CertificateException(e.getMessage(), e.getCause());
+        }
         catch (GeneralSecurityException e)
         {
             throw new CertificateException("Unable to construct a valid chain", e);