Minor updates to the List class, unchecked corner cases.

The CsvWriter now writes csv.  It understands both excel formatting and c-style,
which I made up myself (it's just c-style escape sequences).
Sha1 is converted to work with the CryptoHash API and it does indeed work.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/list.h b/src/list.h
index 6d2246e..3979b63 100644
--- a/src/list.h
+++ b/src/list.h
@@ -871,6 +871,8 @@ namespace Bu
                  */
                 value &first()
                 {
+                        if( core->pFirst->pValue == NULL )
+                                throw Bu::ExceptionBase("Attempt to read first element from empty list.");
                         _hardCopy();
                         return *core->pFirst->pValue;
                 }
@@ -881,6 +883,8 @@ namespace Bu
                  */
                 const value &first() const
                 {
+                        if( core->pFirst->pValue == NULL )
+                                throw Bu::ExceptionBase("Attempt to read first element from empty list.");
                         return *core->pFirst->pValue;
                 }