added check for return of invalid pointer

DaqBuffer.h

@@ -3,7 +3,7 @@
 
 //////////////////////////////////////////////////////////////////////////////////////////
 ///
-/// $Id: DaqBuffer.h,v 1.2 2005/03/14 23:05:03 yiannis Exp $
+/// $Id: DaqBuffer.h,v 1.3 2007/02/09 18:49:14 dheitbri Exp $
 /// 
 /// Date: December 2004
 ///
@@ -120,7 +120,10 @@ CDaqBuffer::GetShort(int ind)     ///< Return short type pointer to data
 inline vector<TDaqByte>::const_pointer 
 CDaqBuffer::GetDataPtr() const 
 { 
+	if (m_Data.size() > 0)
 		return &m_Data[0];
+	else 
+		return NULL;
 };