[sv-ec] copy constructor on handle pointing null

LRM doesn't describe what should happend if handle which we are trying to
copy is equal null like in sample below. Should it trigger runtime error
that this is illegall null refrence, or should it silently assign
destination hadle with null ( performing no allocation)?
 
module top; 
 class C;
  int a;
 endclass 
 C c1,c2 ;
 initial begin
     c1 = new c2;    
 end
endmodule
 
 
 

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