separator : ne pas parser argv[2] s'il est nul

src/separator.c

@@ -12,6 +12,9 @@ static char *separation_character_line(const char *separation_character, const u
     const size_t character_length = strlen(separation_character);
 
     char *line = malloc(line_length * sizeof(char));
+    // Avoiding undefined behaviour with strlen if no null byte is
+    // present at the end of line
+    *line = 0;
 
     while (strlen(line) + character_length <= line_length) {
         strncat(line, separation_character, character_length);
@@ -37,7 +40,7 @@ int main(int argc, char *argv[]) {
         name = "";
     }
 
-    if (argc >= 3) {
+    if (argc >= 3 && *argv[2] != 0) {
         separation_character = argv[2];
     } else {
         separation_character = "=";