fixing: %0b format prints nothing for a 0 input
fixing: %0b format prints nothing for a 0 input

the following example returns ||. This patch fixes it to return |0|.
module t();
wire [3:0] b;
initial
    $monitor("|%0b|", b);
assign b = 0;
endmodule

CastMi/iverilog,themperek/iverilog,CastMi/iverilog,CastMi/iverilog,themperek/iverilog,themperek/iverilog