Allow trailing comma in learning rate

modules/textual_inversion/learn_schedule.py

@@ -11,7 +11,10 @@ class LearnScheduleIterator:
         self.rates = []
         self.it = 0
         self.maxit = 0
+        try:
             for i, pair in enumerate(pairs):
+                if not pair.strip():
+                    continue
                 tmp = pair.split(':')
                 if len(tmp) == 2:
                     step = int(tmp[1])
@@ -28,6 +31,10 @@ class LearnScheduleIterator:
                     self.rates.append((float(tmp[0]), max_steps))
                     self.maxit += 1
                     return
+            assert self.rates
+        except (ValueError, AssertionError):
+            raise Exception("Invalid learning rate schedule")
+
 
     def __iter__(self):
         return self