#8069 Summary ESMRY : Improve robustness and error reporting

ApplicationLibCode/FileInterface/RifOpmHdf5Summary.cpp

@@ -124,7 +124,11 @@ std::string RifOpmHdf5Summary::unitName( const RifEclipseSummaryAddress& resultA
         {
             auto index = it->second;
             auto node  = m_eSmry->summaryNodeList()[index];
-            return m_eSmry->get_unit( node );
+
+            if ( m_eSmry->hasKey( node.keyword ) )
+            {
+                return m_eSmry->get_unit( node );
+            }
         }
     }