Check length of blockdescription before extracting the title and the description. Length can be 0 in some cases

Author: TomMuehlegger

LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step7V5/BlocksOfflineFolder.cs

@@ -641,7 +641,7 @@ public Block GetBlock(ProjectBlockInfo blkInfo, S7ConvertingOptions myConvOpt)
                         retVal.Parameter = Parameter.GetInterfaceOrDBFromStep7ProjectString(myTmpBlk.blkinterface, ref ParaList, blkInfo.BlockType, false, this, retVal, myConvOpt);
                     }
 
-                    if (myTmpBlk.blockdescription != null)
+                    if (myTmpBlk.blockdescription != null && myTmpBlk.blockdescription.Length > 3)
                     {
                         retVal.Title = Project.ProjectEncoding.GetString(myTmpBlk.blockdescription, 3, myTmpBlk.blockdescription[1] - 4);
                         retVal.Description = Project.ProjectEncoding.GetString(myTmpBlk.blockdescription, myTmpBlk.blockdescription[1], myTmpBlk.blockdescription.Length - myTmpBlk.blockdescription[1] - 1).Replace("\n", Environment.NewLine);