SC2: Add helpful feedback when failing to locate SC2 (#1032)

* SC2: The client now throws a descriptive error when ExecuteInfo.txt exists but is empty, and offers more helpful suggestions when the file doesn't exist.

* SC2: Replaced the new RuntimeError with a warning in the logger to keep things consistent.

* Removed communism

Co-authored-by: black-sliver <59490463+black-sliver@users.noreply.github.com>

Co-authored-by: black-sliver <59490463+black-sliver@users.noreply.github.com>

Starcraft2Client.py

@@ -793,7 +793,12 @@ def check_game_install_path() -> bool:
         with open(einfo) as f:
             content = f.read()
         if content:
+            try:
                 base = re.search(r" = (.*)Versions", content).group(1)
+            except AttributeError:
+                sc2_logger.warning(f"Found {einfo}, but it was empty. Run SC2 through the Blizzard launcher, then "
+                                   f"try again.")
+                return False
             if os.path.exists(base):
                 executable = sc2.paths.latest_executeble(Path(base).expanduser() / "Versions")
 
@@ -810,7 +815,8 @@ def check_game_install_path() -> bool:
             else:
                 sc2_logger.warning(f"{einfo} pointed to {base}, but we could not find an SC2 install there.")
     else:
-        sc2_logger.warning(f"Couldn't find {einfo}. Please run /set_path with your SC2 install directory.")
+        sc2_logger.warning(f"Couldn't find {einfo}. Run SC2 through the Blizzard launcher, then try again. "
+                           f"If that fails, please run /set_path with your SC2 install directory.")
     return False