Description of problem:
If the file /var/run/tuned/ktune-cpuspeed.save is empty, /etc/sysconfig/cpuspeed will be made empty upon default profile change because of the code  in file /etc/tune-profiles/functions


~~~
set_cpu_governor() {
        governor=$1

        # always patch cpuspeed configuration if exists, if it doesn't exist and is enabled,
        # explictly disable it with hint
        if [ -e $CPUSPEED_INIT ]; then
                if [ ! -e $CPUSPEED_SAVE_FILE -a -e $CPUSPEED_CFG ]; then
                        cp -p $CPUSPEED_CFG $CPUSPEED_SAVE_FILE
                        sed -e 's/^GOVERNOR=.*/GOVERNOR='$governor'/g' $CPUSPEED_SAVE_FILE > $CPUSPEED_CFG
                fi
        else
                if [ "$CPUSPEED_USE" = "1" ]; then
                        echo >&2
                        echo "Suggestion: install 'cpuspeed' package to get best tuning results." >&2
                        echo "Falling back to sysfs control." >&2
                        echo >&2
                fi

                CPUSPEED_USE="0"
        fi
[...]
restore_cpu_governor() {
        if [ -e $CPUSPEED_INIT ]; then
                if [ -e $CPUSPEED_SAVE_FILE ]; then
                        cp -fp $CPUSPEED_SAVE_FILE $CPUSPEED_CFG
                        rm -f $CPUSPEED_SAVE_FILE
                fi

~~~~

Version-Release number of selected component (if applicable):
tuned-0.2.19-18.el6.noarch

How reproducible:
always

Steps to Reproduce:
1. start tuned
2. switch to profile enterprise-storage: # tuned-adm profile enterprise-storage
3. make file /var/run/tuned/ktune-cpuspeed.save empty
4. switch to profile throughput-performance: # tuned-adm-profile throughput-performance
5. verify that /etc/sysconfig/cpuspeed is empty

Actual results:
/etc/sysconfig/cpuspeed is empty

Expected results:
the /etc/sysconfig/cpuspeed file should not be emptied if /var/run/tuned/ktune-cpuspeed.save is empty

Additional info: