fixed problem with empty xfrm in groups

common/Shapes/Serialize.js

@@ -4924,7 +4924,27 @@ function BinaryPPTYLoader()
 
         s.Seek2(_end_rec);
         return shape;
-    }
+    };
+
+    this.CheckGroupXfrm = function(oGroup){
+        if(!oGroup || !oGroup.spPr){
+            return;
+        }
+        if(!oGroup.spPr.xfrm){
+            var oXfrm = new AscFormat.CXfrm();
+            oXfrm.setOffX(0);
+            oXfrm.setOffY(0);
+            oXfrm.setChOffX(0);
+            oXfrm.setChOffY(0);
+            oXfrm.setExtX(50);
+            oXfrm.setExtY(50);
+            oXfrm.setChExtX(50);
+            oXfrm.setChExtY(50);
+            oGroup.spPr.setXfrm(oXfrm);
+            oGroup.updateCoordinatesAfterInternalResize();
+            oGroup.spPr.xfrm.setParent(oGroup.spPr);
+        }
+    };
 
     this.ReadGroupShape = function()
     {
@@ -5045,7 +5065,7 @@ function BinaryPPTYLoader()
                 }
             }
         }
-
+        this.CheckGroupXfrm(shape);
         s.Seek2(_end_rec);
         this.TempGroupObject = null;
         return shape;
@@ -9183,7 +9203,8 @@ function CPres()
                     }
                 }
             }
-
+            
+            this.Reader.CheckGroupXfrm(shape);
             this.ParaDrawing = oldParaDrawing;
             s.Seek2(_end_rec);
             this.TempGroupObject = null;