[Resolver][LazySpecification] Use new raise_if_missing parameter to subspec_by_name

Gemfile.lock

@@ -7,7 +7,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Core.git
-  revision: dad46458c14c2ddf717d9d0fd49c0c18e4e13617
+  revision: 86c02faa738990d2ab10bbe07339de681637f8b4
   branch: resolver
   specs:
     cocoapods-core (0.34.4)

lib/cocoapods/resolver.rb

@@ -106,13 +106,7 @@ module Pod
         specs = find_cached_set(dependency).
           all_specifications.
           select { |s| dependency.requirement.satisfied_by? s.version }.
-          map do |s|
-            begin
-              s.subspec_by_name dependency.name
-            rescue
-              nil
-            end
-          end.compact
+          map { |s| s.subspec_by_name(dependency.name, false) }
 
         specs.
           reverse.

lib/cocoapods/resolver/lazy_specification.rb

@@ -14,11 +14,11 @@ module Pod
           specification.send(method, *args, &block)
         end
 
-        def subspec_by_name(name = nil)
+        def subspec_by_name(name = nil, raise_if_missing = true)
           if !name || name == self.name
             self
           else
-            specification.subspec_by_name(name)
+            specification.subspec_by_name(name, raise_if_missing)
           end
         end