Fix: Rework system check so it won't crash if tesseract is not found (#7640)

src/paperless/checks.py

@@ -78,7 +78,7 @@ def binaries_check(app_configs, **kwargs):
     error = "Paperless can't find {}. Without it, consumption is impossible."
     hint = "Either it's not in your ${PATH} or it's not installed."
 
-    binaries = (settings.CONVERT_BINARY, "tesseract")
+    binaries = (settings.CONVERT_BINARY, "tesseract", "gs")
 
     check_messages = []
     for binary in binaries:

src/paperless_tesseract/checks.py

@@ -21,26 +21,32 @@ def get_tesseract_langs():
 
 @register()
 def check_default_language_available(app_configs, **kwargs):
-    installed_langs = get_tesseract_langs()
+    errs = []
 
     if not settings.OCR_LANGUAGE:
-        return [
+        errs.append(
             Warning(
                 "No OCR language has been specified with PAPERLESS_OCR_LANGUAGE. "
                 "This means that tesseract will fallback to english.",
             ),
-        ]
+        )
+        return errs
 
-    specified_langs = settings.OCR_LANGUAGE.split("+")
+    # binaries_check in paperless will check and report if this doesn't exist
+    # So skip trying to do anything here and let that handle missing binaries
+    if shutil.which("tesseract") is not None:
+        installed_langs = get_tesseract_langs()
+
+        specified_langs = [x.strip() for x in settings.OCR_LANGUAGE.split("+")]
 
         for lang in specified_langs:
             if lang not in installed_langs:
-            return [
+                errs.append(
                     Error(
                         f"The selected ocr language {lang} is "
                         f"not installed. Paperless cannot OCR your documents "
                         f"without it. Please fix PAPERLESS_OCR_LANGUAGE.",
                     ),
-            ]
+                )
 
-    return []
+    return errs