implement working 3rd party launcher detection

installer.py

@@ -120,16 +120,14 @@ def check_if_exists_and_delete_file(filepath):
     else:
         pass
 
-global detectedlauncher
-detectedlauncher = "null"
-
 def check_for_launcher_files(filepath, launchername):
     #checks for evidence of 3rd party launchers and sets a variable flag if a launcher is installed
     if os.path.exists(filepath):
-        print("[INFO]: Detected Minecraft launcher: " + str(launchername))
+        global detectedlauncher
         detectedlauncher = str(launchername)
+        print("[INFO]: Detected Minecraft launcher: " + str(launchername))
     else:
-        raise customerror("[ERR!]: File not detected.")
+        print("[DBUG]: " + launchername + " not detected.")
 
 
 # --------------------the real shit!------------------------
@@ -144,18 +142,19 @@ global modfolder
 # `global` sets these variables to exist outside of the scope of these specific `if` statements.
 
 if platform.system() == "Linux":
-    print("Operating system detected: Linux")
+    print("[INFO]: Operating system detected: Linux")
 
-    try:
+    detectedlauncher = "OfficialLauncher"
     check_for_launcher_files(str(Path.cwd()) + "/.local/share/PrismLauncher", "PrismLauncherPackage")
     check_for_launcher_files(str(Path.cwd()) + "/.var/app/org.prismlauncher.Prism.Launcher", "PrismLauncherFlatpak")
-    except customerror as e:
-        pass
+
+    if detectedlauncher == "OfficialLauncher":
+        print("[INFO]: No 3rd party launchers detected, falling back to default official launcher directories")
 
     os.chdir(".minecraft")
     mcfolder = str(Path.cwd())
     modfolder = mcfolder + '/mods'
-    print("Changed current working directory to '" + str(mcfolder) + "'")
+    print("[INFO]: Changed current working directory to '" + str(mcfolder) + "'")
     
     time.sleep(1)
     print()
@@ -204,7 +203,7 @@ except:
 extract_tar('mods.tar.gz', 'mods')
     #      ('tarfile', 'directory to extract to')
 
-print(); print("sigma!")
+print(""); print("sigma!")
 print("all done!")
 print("This window will exit and close in ten seconds. :)")
 time.sleep(9)