stats_engine: Skip non-existant source files

Author: raymanfx

stats_engine.py

@@ -133,8 +133,13 @@ def collect_stats(kernel_repo, cve_patch):
 
     # check which lines of the patch have been added already
     for file in patch_added_lines:
+        file_path = kernel_repo + '/' + file
+        # just skip nonexisting files
+        if not os.path.exists(file_path):
+            continue
+
         fp_contents = [line.rstrip('\n') for line in
-                       open(kernel_repo + '/' + file, 'r') if line.strip()]
+                       open(file_path, 'r') if line.strip()]
 
         # we need this array so we can check the above block
         all_added = []
@@ -181,8 +186,13 @@ def collect_stats(kernel_repo, cve_patch):
                             actually_added_lines += len(added)
 
     for file in patch_removed_lines:
+        file_path = kernel_repo + '/' + file
+        # just skip nonexisting files
+        if not os.path.exists(file_path):
+            continue
+
         fp_contents = [line.rstrip('\n') for line in
-                       open(kernel_repo + '/' + file, 'r') if line.strip()]
+                       open(file_path, 'r') if line.strip()]
 
         for i in range(0, len(fp_contents)):
             lines = fp_contents[i:i+2]