pddf_thermalutil gettemp will show a stranger result when the temperature value is 0.

[nonodark]

Description

"pddf_thermalutil gettemp" will show a stranger result when the temperature value is 0.

Steps to reproduce the issue

1. execute "pddf_thermalutil gettemp" when the thermal sensor gets a 0 value.

Describe the results you received

[Command]: tempershow
          Sensor    Temperature    High TH    Low TH    Crit High TH    Crit Low TH    Warning          Timestamp
----------------  -------------  ---------  --------  --------------  -------------  ---------  -----------------
      PSU1_TEMP1              0        N/A       N/A             N/A            N/A      False  20230523 01:48:59
      PSU2_TEMP1             37        N/A       N/A             N/A            N/A      False  20230523 01:48:59
    TEMP_ENV_BMC             40       80.0       N/A            85.0            N/A      False  20230523 01:48:59
TEMP_ENV_MACCASE             42       75.0       N/A            85.0            N/A      False  20230523 01:48:59
TEMP_ENV_PSUCASE             38       70.0       N/A            75.0            N/A      False  20230523 01:48:59
TEMP_ENV_SSDCASE             44       75.0       N/A            80.0            N/A      False  20230523 01:48:59
        TEMP_MAC             45       95.0       N/A           105.0            N/A      False  20230523 01:48:59
 TEMP_PSU0_TEMP1              0       65.0       N/A            70.0            N/A      False  20230523 01:48:59
 TEMP_PSU1_TEMP1             37       65.0       N/A            70.0            N/A      False  20230523 01:48:59



[Command]: pddf_thermalutil gettemp
Temp Sensor       Value
----------------  -------
TEMP_MAC          temp1	 +45.0 C (high = +95.0 C, crit = +105.0 C)
TEMP_ENV_MACCASE  temp1	 +42.0 C (high = +75.0 C, crit = +85.0 C)
TEMP_ENV_SSDCASE  temp1	 +44.0 C (high = +75.0 C, crit = +80.0 C)
TEMP_ENV_PSUCASE  temp1	 +38.0 C (high = +70.0 C, crit = +75.0 C)
TEMP_ENV_BMC      temp1	 +40.0 C (high = +80.0 C, crit = +85.0 C)
TEMP_PSU0_TEMP1   temp1	 +40.0 C (high = +80.0 C, crit = +85.0 C)high = +65.0 C, crit = +70.0 C) ---> this is stranger
TEMP_PSU1_TEMP1   temp1	 +38.0 C (high = +65.0 C, crit = +70.0 C)

Describe the results you expected

TEMP_PSU0_TEMP1 is 0

[Command]: pddf_thermalutil gettemp
Temp Sensor       Value
----------------  -------
TEMP_MAC          temp1	 +45.0 C (high = +95.0 C, crit = +105.0 C)
TEMP_ENV_MACCASE  temp1	 +42.0 C (high = +75.0 C, crit = +85.0 C)
TEMP_ENV_SSDCASE  temp1	 +44.0 C (high = +75.0 C, crit = +80.0 C)
TEMP_ENV_PSUCASE  temp1	 +38.0 C (high = +70.0 C, crit = +75.0 C)
TEMP_ENV_BMC      temp1	 +40.0 C (high = +80.0 C, crit = +85.0 C)
TEMP_PSU0_TEMP1   temp1	 +0.0 C (high = +65.0 C, crit = +70.0 C)
TEMP_PSU1_TEMP1   temp1	 +38.0 C (high = +65.0 C, crit = +70.0 C)

TEMP_PSU0_TEMP1 is not available

[Command]: pddf_thermalutil gettemp
Temp Sensor       Value
----------------  -------
TEMP_MAC          temp1	 +45.0 C (high = +95.0 C, crit = +105.0 C)
TEMP_ENV_MACCASE  temp1	 +42.0 C (high = +75.0 C, crit = +85.0 C)
TEMP_ENV_SSDCASE  temp1	 +44.0 C (high = +75.0 C, crit = +80.0 C)
TEMP_ENV_PSUCASE  temp1	 +38.0 C (high = +70.0 C, crit = +75.0 C)
TEMP_ENV_BMC      temp1	 +40.0 C (high = +80.0 C, crit = +85.0 C)
TEMP_PSU0_TEMP1   temp1	 N/A (high = +65.0 C, crit = +70.0 C)
TEMP_PSU1_TEMP1   temp1	 +38.0 C (high = +65.0 C, crit = +70.0 C)

Additional information you deem important (e.g. issue happens only occasionally)

Output of show version

(paste your output here)
root@sonic:~# show version

SONiC Software Version: SONiC.master-local.0-dirty-20230522.183320
SONiC OS Version: 11
Distribution: Debian 11.7
Kernel: 5.10.0-18-2-amd64
Build commit: d1b7ba44b
Build date: Mon May 22 10:38:52 UTC 2023
Built by: nonodark@u18