SIGFPE if dps_plot_points < 6

[0xjc]

Describe the bug

SIGFPE in print_html_player_plots if using dps_plot_stat with dps_plot_points < 6.

Expected behavior

No crash

To Reproduce

Add to any sim with html report

dps_plot_stat=crit
dps_plot_step=1000
dps_plot_points=5
dps_plot_iterations=1000

Additional information

• SimulationCraft Version (required)
  trunk (b9cf995)

Stack trace:

Thread 1 "simc" received signal SIGFPE, Arithmetic exception.
0x0000555557893ac5 in (anonymous namespace)::print_html_player_plots (os=..., p=...) at /home/ubuntu/wow/simc/engine/report/report_html_player.cpp:3254
3254            if ( idx % rows == 0 )
(gdb) p rows
$1 = 0
(gdb) bt
#0  0x0000555557893ac5 in (anonymous namespace)::print_html_player_plots (os=..., p=...) at /home/ubuntu/wow/simc/engine/report/report_html_player.cpp:3254
#1  0x00005555578b198c in (anonymous namespace)::print_html_player_ (p=..., os=...) at /home/ubuntu/wow/simc/engine/report/report_html_player.cpp:4954
#2  report::print_html_player (os=..., p=...) at /home/ubuntu/wow/simc/engine/report/report_html_player.cpp:5029
#3  0x000055555787c8b1 in (anonymous namespace)::print_html_ (sim=..., os=...) at /home/ubuntu/wow/simc/engine/report/report_html_sim.cpp:1236
#4  report::print_html (sim=...) at /home/ubuntu/wow/simc/engine/report/report_html_sim.cpp:1360
#5  0x0000555557726960 in report::print_suite (sim=sim@entry=0x7fffffffc710) at /home/ubuntu/wow/simc/engine/report/reports.cpp:259
#6  0x0000555556f2cafd in sim_t::main (this=this@entry=0x7fffffffc710, args=std::vector of length 1, capacity 1 = {...}) at /home/ubuntu/wow/simc/engine/sc_main.cpp:368
#7  0x0000555556f2cca7 in main (argc=2, argv=0x7fffffffdf28) at /home/ubuntu/wow/simc/engine/sc_main.cpp:408