jj: throw exception instead of swallowing

Modules.Database/Firebird.vb

@@ -157,7 +157,7 @@ Public Class Firebird
             Return True
         Catch ex As Exception
             _logger.Error(ex, $"Error in ExecuteNonQuery while executing command: '{SqlCommand}'")
-            Return False
+            Throw ex
         End Try
     End Function
 
@@ -200,7 +200,7 @@ Public Class Firebird
             Return oResult
         Catch ex As Exception
             _logger.Error(ex, $"Error in ReturnScalar while executing command: '{SqlQuery}'")
-            Return Nothing
+            Throw ex
         End Try
     End Function