bugfix: check 0 sized file

opencv-motion-detect/Makefile

@@ -48,7 +48,7 @@ HEADERS=-Iinc -Ivendor/include
 SQLITE_SRC=
 SQLITE=
 
-all: evmgr evpuller evpusher evslicer evmlmotion evmlmotion_d evdaemon evcloudsvc
+all: evmgr evpuller evpusher evslicer evmlmotion evdaemon evcloudsvc
 
 # sqlite C object
 sqlite3.o: vendor/sqlite/sqlite3.c