Revert "Replace appends with functions"

This reverts commit 9a30659731.

blocking.py

@@ -1740,20 +1740,24 @@ def import_blocking_file(base_dir: str, nickname: str, domain: str,
     if not append_blocks:
         return True
 
-    text = ''
-    for new_block in append_blocks:
-        text += new_block + '\n'
-    append_string(text, blocking_filename,
-                  'EX: ' +
-                  'unable to append imported blocks to ' +
-                  blocking_filename)
-    text = ''
-    for new_reason in append_reasons:
-        text += new_reason + '\n'
-    append_string(text, blocking_reasons_filename,
-                  'EX: ' +
-                  'unable to append imported block reasons to ' +
-                  blocking_reasons_filename)
+    try:
+        with open(blocking_filename, 'a+', encoding='utf-8') as fp_blocks:
+            for new_block in append_blocks:
+                fp_blocks.write(new_block + '\n')
+    except OSError:
+        print('EX: ' +
+              'unable to append imported blocks to ' +
+              blocking_filename)
+
+    try:
+        with open(blocking_reasons_filename, 'a+',
+                  encoding='utf-8') as fp_blocks:
+            for new_reason in append_reasons:
+                fp_blocks.write(new_reason + '\n')
+    except OSError:
+        print('EX: ' +
+              'unable to append imported block reasons to ' +
+              blocking_reasons_filename)
 
     return True