Handle dateparser ValueErrors

When parsing dates from the document text or filenames, correctly handle values
errors indicating broken dates. Newly added tests ensure that this handling
works properly.

src/documents/parsers.py

@@ -108,7 +108,7 @@ class DocumentParser:
 
                 try:
                     date = __parser(date_string, self.FILENAME_DATE_ORDER)
-                except TypeError:
+                except (TypeError, ValueError):
                     # Skip all matches that do not parse to a proper date
                     continue
 
@@ -134,7 +134,7 @@ class DocumentParser:
 
             try:
                 date = __parser(date_string, self.DATE_ORDER)
-            except TypeError:
+            except (TypeError, ValueError):
                 # Skip all matches that do not parse to a proper date
                 continue
 

src/paperless_tesseract/tests/test_date.py

@@ -172,3 +172,29 @@ class TestDate(TestCase):
         document = RasterisedDocumentParser("/dev/null")
         document.get_text()
         self.assertIsNone(document.get_date())
+
+    @mock.patch(
+        "paperless_tesseract.parsers.RasterisedDocumentParser.get_text",
+        return_value="20 408000l 2475"
+    )
+    @mock.patch(MOCK_SCRATCH, SCRATCH)
+    def test_crazy_date_with_spaces(self, *args):
+        document = RasterisedDocumentParser("/dev/null")
+        document.get_text()
+        self.assertIsNone(document.get_date())
+
+    @mock.patch(
+        "paperless_tesseract.parsers.RasterisedDocumentParser.get_text",
+        return_value="No date in here"
+    )
+    @mock.patch(
+        "paperless_tesseract.parsers.RasterisedDocumentParser."
+        "FILENAME_DATE_ORDER",
+        new_callable=mock.PropertyMock,
+        return_value="YMD"
+    )
+    @mock.patch(MOCK_SCRATCH, SCRATCH)
+    def test_filename_date_parse_invalid(self, *args):
+        document = RasterisedDocumentParser("/tmp/20 408000l 2475 - test.pdf")
+        document.get_text()
+        self.assertIsNone(document.get_date())