Remove unneeded try/catch (#733)

diff --git a/.dockerignore b/.dockerignore
index e7bc7c3..dfeb00e 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -18,5 +18,4 @@
 .emscripten_sanity_wasm
 .flake8
 emscripten-releases-tot.txt
-legacy-*-tags.txt
 README.md
diff --git a/emsdk.py b/emsdk.py
index ed560ee..93463c4 100644
--- a/emsdk.py
+++ b/emsdk.py
@@ -2137,17 +2137,11 @@
 # Lists all legacy (pre-emscripten-releases) tagged versions directly in the Git
 # repositories. These we can pull and compile from source.
 def load_legacy_emscripten_tags():
-  try:
-    return open(sdk_path('legacy-emscripten-tags.txt'), 'r').read().split('\n')
-  except:
-    return []
+  return open(sdk_path('legacy-emscripten-tags.txt'), 'r').read().split('\n')
 
 
 def load_legacy_binaryen_tags():
-  try:
-    return open(sdk_path('legacy-binaryen-tags.txt'), 'r').read().split('\n')
-  except:
-    return []
+  return open(sdk_path('legacy-binaryen-tags.txt'), 'r').read().split('\n')
 
 
 def remove_prefix(s, prefix):