sh+edit: Miscellaneous fixes

apps/edit.c

@@ -25,7 +25,6 @@ int main(int argc, char** argv)
     {
         char* rc = fgets(buffer, sizeof(buffer), stdin);
         if (rc == 0) break;
-        if (!strcmp(rc, "EOF\n")) break;
         fputs(buffer, f);
     }
 

apps/sh.c

@@ -85,6 +85,8 @@ int main()
         char* rc = fgets(command, sizeof(command), stdin);
         if (!rc) return 0;
 
+        if (strspn(command, " \n") == strlen(command)) continue;
+
         pid_t child = fork();
         if (child < 0)
         {