fix: Catch exception when the ELF file is modified

This commit fixes the issue where the ELF file is modified while the
panic decoder is running. The decoder now catches the exception and
prints a error message.

Closes #1

esp_idf_panic_decoder/pc_address_decoder.py

@@ -61,4 +61,7 @@ def lookup_pc_address(self, pc_addr: str, is_rom: bool = False) -> Optional[str]
                 return decoded if not is_rom else decoded.replace('at ??:?', 'in ROM')
         except OSError as err:
             red_print(f'{" ".join(cmd)}: {err}')
+        except subprocess.CalledProcessError as err:
+            red_print(f'{" ".join(cmd)}: {err}')
+            red_print('ELF file is missing or has changed, the build folder was probably modified.')
         return None