custominstall: don't extract or rebuild title.db if no titles were installed

custominstall.py

@@ -162,14 +162,11 @@ class CustomInstall:
         # TODO: Move a lot of these into their own methods
         self.log("Finding path to install to...")
         [sd_path, id1s] = self.get_sd_path()
-        try:
         if len(id1s) > 1:
             raise SDPathError(f'There are multiple id1 directories for id0 {crypto.id0.hex()}, '
                               f'please remove extra directories')
         elif len(id1s) == 0:
             raise SDPathError(f'Could not find a suitable id1 directory for id0 {crypto.id0.hex()}')
-        except SDPathError:
-            self.log("")
 
         cifinish_path = join(self.sd, 'cifinish.bin')
         sd_path = join(sd_path, id1s[0])
@@ -369,8 +366,10 @@ class CustomInstall:
 
             cifinish_data[int(cia.tmd.title_id, 16)] = {'seed': (cia.contents[0].seed if cia.contents[0].flags.uses_seed else None)}
 
+        # This is saved regardless if any titles were installed, so the file can be upgraded just in case.
         save_cifinish(cifinish_path, cifinish_data)
 
+        if title_info_entries:
             with TemporaryDirectory(suffix='-custom-install') as tempdir:
                 # set up the common arguments for the two times we call save3ds_fuse
                 save3ds_fuse_common_args = [
@@ -398,6 +397,9 @@ class CustomInstall:
             self.log('FINAL STEP:\nRun custom-install-finalize through homebrew launcher.')
             self.log('This will install a ticket and seed if required.')
 
+        else:
+            self.log('Did not install any titles.', 2)
+
     def get_sd_path(self):
         sd_path = join(self.sd, 'Nintendo 3DS', self.crypto.id0.hex())
         id1s = []