[lldb/crashlog] Fix crash when loading non-symbolicated report

This patch should address the crashes when parsing a the crash report
frame dictionary.

If the crash report is not symbolicated, the `symbolLocation` key will
be missing. In that case, we should just use the `imageOffset`.

rdar://109836386

Differential Revision: https://reviews.llvm.org/D151844

Signed-off-by: Med Ismail Bennani <[email protected]>

Author: medismailben

lldb/examples/python/crashlog.py

@@ -545,9 +545,11 @@ def parse_frames(self, thread, json_frames):
             image_addr = self.get_used_image(image_id)['base']
             pc = image_addr + frame_offset
 
-            if 'symbol' in json_frame:
-                symbol = json_frame['symbol']
-                location = int(json_frame['symbolLocation'])
+            if "symbol" in json_frame:
+                symbol = json_frame["symbol"]
+                location = 0
+                if "symbolLocation" in json_frame and json_frame["symbolLocation"]:
+                    location = int(json_frame["symbolLocation"])
                 image = self.images[image_id]
                 image.symbols[symbol] = {
                     "name": symbol,