Get Files from File input line to match user expectation

- If a user manually edits the input file lines, clicking start should
  use that. Currently it just looks at the files selected last via file
  browser
- We want to allow users to manually enter file paths in field. Which
  is why the field hasn't been set to read-only

src/interface/desktop/configure_screen.py

@@ -157,7 +157,7 @@ class ConfigureScreen(QtWidgets.QDialog):
                         default_search_config = self.get_default_config(search_type = child.search_type)
                         self.new_config['content-type'][child.search_type.value] = merge_dicts(current_search_config, default_search_config)
                 elif isinstance(child, FileBrowser) and child.search_type in self.new_config['content-type']:
-                    self.new_config['content-type'][child.search_type.value]['input-files'] = child.getPaths()
+                    self.new_config['content-type'][child.search_type.value]['input-files'] = child.getPaths() if child.getPaths() != [] else None
 
     def update_processor_settings(self):
         "Update config with conversation settings from UI"

src/interface/desktop/file_browser.py

@@ -65,4 +65,7 @@ class FileBrowser(QtWidgets.QWidget):
             self.lineEdit.setText(",".join(self.filepaths))    
 
     def getPaths(self):
-        return self.filepaths
+        if self.lineEdit.text() == '':
+            return []
+        else:
+            return self.lineEdit.text().split(',')