[Telemetry] Consider linux distribution number is 0 when it cannot be parsed

tools/telemetry/telemetry/core/platform/linux_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/linux_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/platform/linux_platform_backend.py b/tools/telemetry/telemetry/core/platform/linux_platform_backend.py
index e2535208bcc9ee88078cae30a9c30d250a2ba76c..89d9dd392c575bb0ea850e5a125fb327d9bec1b9 100644
--- a/tools/telemetry/telemetry/core/platform/linux_platform_backend.py
+++ b/tools/telemetry/telemetry/core/platform/linux_platform_backend.py
@@ -44,15 +44,17 @@ class LinuxPlatformBackend(
 
     codename = None
     version = None
-    with open('/etc/lsb-release') as f:
-      for line in f.readlines():
-        key, _, value = line.partition('=')
-        if key == 'DISTRIB_CODENAME':
-          codename = value.strip()
-        elif key == 'DISTRIB_RELEASE':
+    for line in self._GetFileContents('/etc/lsb-release').splitlines():
+      key, _, value = line.partition('=')
+      if key == 'DISTRIB_CODENAME':
+        codename = value.strip()
+      elif key == 'DISTRIB_RELEASE':
+        try:
           version = float(value)
-        if codename and version:
-          break
+        except ValueError:
+          version = 0
+      if codename and version:
+        break
     return platform_backend.OSVersion(codename, version)
 
   def CanFlushIndividualFilesFromSystemCache(self):