Tidy some if condition -> EAFP

src/ocrmypdf/__main__.py

@@ -63,7 +63,7 @@ def run(args=None):
         log.error(e)
         return ExitCode.missing_dependency
 
-    if hasattr(signal, 'SIGBUS'):
+    with suppress(AttributeError, OSError):
         signal.signal(signal.SIGBUS, sigbus)
 
     result = run_pipeline(options=options, plugin_manager=plugin_manager)

src/ocrmypdf/optimize.py

@@ -266,7 +266,7 @@ def extract_images(
             if image.objgen[1] != 0:
                 continue  # Ignore images in an incremental PDF
             xref = Xref(image.objgen[0])
-            if hasattr(image, 'SMask'):
+            if Name.SMask in image:
                 # Ignore soft masks
                 smask_xref = Xref(image.SMask.objgen[0])
                 exclude_xrefs.add(smask_xref)