[TW#15752] When only <SPACE> char are inputted in example/system/console leads to core dump

[jstoi]

Built the console example on Windows with latest toolchain and esp-idf.
Same behavior when using esp-idf make monitor or PuTTY.
esp32> is ok
esp32> resulted in this error:

$ make monitor
MONITOR
--- idf_monitor on COM3 115200 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
ets Jun 8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x3f (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0010,len:4
load:0x3fff0014,len:4668
load:0x40078000,len:0
load:0x40078000,len:13468
entry 0x40078d20
W (68) rtc_clk: Possibly invalid CONFIG_ESP32_XTAL_FREQ setting (40MHz). Detected 40 MHz.
I (206) cpu_start: Pro cpu up.
I (206) cpu_start: Starting app cpu, entry point is 0x40080fcc
0x40080fcc: call_start_cpu1 at C:/projects/esp-idf/components/esp32/cpu_start.c:219

I (0) cpu_start: App cpu up.
I (209) heap_init: Initializing. RAM available for dynamic allocation:
I (216) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (222) heap_init: At 3FFB8680 len 00027980 (158 KiB): DRAM
I (228) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (235) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (241) heap_init: At 40090E4C len 0000F1B4 (60 KiB): IRAM
I (247) cpu_start: Pro cpu start user code
I (265) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.

This is an example of ESP-IDF console component.
Type 'help' to get the list of commands.
Use UP/DOWN arrows to navigate through command history.
Press TAB when typing command name to auto-complete.
?[5n
Your terminal application does not support escape sequences.
Line editing and history features are disabled.
On Windows, try using Putty instead.
esp32>
esp32>
Guru Meditation Error of type LoadProhibited occurred on core 0. Exception was unhandled.
Register dump:
PC : 0x40001277 PS : 0x00060d30 A0 : 0x80119079 A1 : 0x3ffbf6e0
A2 : 0x00000000 A3 : 0x3f40c4c8 A4 : 0x00000004 A5 : 0x3ffae8d4
A6 : 0x7fffff80 A7 : 0x3f40f96e A8 : 0x80082e78 A9 : 0x3ffbf6c0
A10 : 0x3ffc1da0 A11 : 0x00000000 A12 : 0x00000020 A13 : 0x3ffc1dc0
A14 : 0x00000020 A15 : 0x00000002 SAR : 0x00000018 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x4000c46c LEND : 0x4000c477 LCOUNT : 0x00000000

Backtrace: 0x40001277:0x3ffbf6e0 0x40119076:0x3ffbf6f0 0x4011928c:0x3ffbf710 0x400ffca4:0x3ffbf730 0x400d0d0f:0x3ffbf760
0x40119076: find_command_by_name at C:/projects/esp-idf/components/console/commands.c:85

0x4011928c: esp_console_run at C:/projects/esp-idf/components/console/commands.c:189

0x400ffca4: app_main at C:/projects/MaKit1/console/main/console_example_main.c:153

0x400d0d0f: main_task at C:/projects/esp-idf/components/esp32/cpu_start.c:403

Rebooting...
ets Jun 8 2016 00:22:57