Fix pasting memories past end of range

The memory editor will fail with a 'KeyError: N' error if the user
attempts to paste more memories than will fit. This makes us not
choke, stop when we get to the end, and report to the user (unless
the memories that don't fit are empty).

Fixes #11510

chirp/wxui/memedit.py

@@ -1984,7 +1984,12 @@ def _cb_paste_memories(self, payload, row=None):
 
         overwrite = []
         for i in range(len(mems)):
-            mem = self._memory_cache[row + i]
+            try:
+                mem = self._memory_cache[row + i]
+            except KeyError:
+                # No more memories in the target. This will be handled/reported
+                # in the actual paste loop below.
+                break
             if not mem.empty:
                 overwrite.append(mem.extd_number or mem.number)
 
@@ -2015,7 +2020,20 @@ def _cb_paste_memories(self, payload, row=None):
         errormsgs = []
         modified = False
         for mem in mems:
-            existing = self._memory_cache[row]
+            try:
+                existing = self._memory_cache[row]
+            except KeyError:
+                if not mem.empty:
+                    LOG.debug('Not pasting to row %i beyond end of memory',
+                              row)
+                    errormsgs.append(
+                        (mem, _('No more space available; '
+                                'some memories were not applied')))
+                    break
+                else:
+                    # Don't complain about empty memories past the end of the
+                    # current radio's memory upper bound.
+                    continue
             number = self.row2mem(row)
             # We need to disable immutable checking while we reassign these
             # numbers. This might be a flag that we should be copying things