This update force program to throw error when the user give invalid parameter of dictionary files.
Now, the program executes endless loop when cannot open dictionary files.
Coverage remained the same when pulling 2197eafa8d284aeec16f5450c2a51b4e67a67db2 on tako-black:throwFileOpenError into 4ed2bc8b0b26fdbd790df53614322d1beec2027f on takuyaa:master.
This update force program to throw error when the user give invalid parameter of dictionary files. Now, the program executes endless loop when cannot open dictionary files.