Don't raise in mach_data so the debugger doesn't catch it

Closes Homebrew/homebrew#33088.

Library/Homebrew/mach.rb

@@ -53,7 +53,10 @@ module MachO
   # /usr/include/mach-o/fat.h
 
   def mach_data
-    @mach_data ||= begin
+    @mach_data ||= _mach_data
+  end
+
+  def _mach_data
     offsets = []
     mach_data = []
 
@@ -73,7 +76,7 @@ module MachO
     when 0x7f454c46 # ELF
       mach_data << { :arch => :x86_64, :type => :executable }
     else
-        raise "Not a Mach-O binary."
+      return []
     end
 
     offsets.each do |offset|
@@ -94,10 +97,8 @@ module MachO
 
       mach_data << { :arch => arch, :type => type }
     end
+
     mach_data
-    rescue
-      []
-    end
   end
 
   def archs