Make safe readTemperature

[annndruha]

• Adafruit-BMP085-Library v1.2.4
• NodeMCUv2
• BPM180

Hello! While i use BPM180 with ESP8266WebServer sometimes one a month server stop to response. I figured out that problem at error with method readTemperature. Probably wires lost connect. But instead of some NaN return from readTemperature it was crash all code.

Below a Decoded stacktrace:

ESP Exception Decoder
Sketch: NodeMCU_BPM180_DHT11 FQBN: esp8266:esp8266:nodemcuv2

Exception (6):
epc1=0x402057ac epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffe40 end: 3fffffd0 offset: 0150
3fffff90:  3fffdad0 00000004 3ffee964 402059cc  
3fffffa0:  3fffdad0 00000000 3ffeeaec 40203cdd  
3fffffb0:  3fffdad0 00000000 3ffeeb64 40207f30  
3fffffc0:  feefeffe feefeffe 3fffdab0 40101095  
<<<stack<<<

Exception 6: IntegerDivideByZero: QUOS, QUOU, REMS, or REMU divisor operand is zero
PC: 0x402057ac: Adafruit_BMP085::computeB5(int) at ...\libraries\Adafruit_BMP085_Library\Adafruit_BMP085.cpp:101
EXCVADDR: 0x00000000

Decoding stack results
0x402059cc: Adafruit_BMP085::readTemperature() at ...\libraries\Adafruit_BMP085_Library\Adafruit_BMP085.cpp:266
0x40203cdd: loop() at ...\NodeMCU_BPM180_DHT11\NodeMCU_BPM180_DHT11.ino:55
0x40207f30: loop_wrapper() at ...

which says that some IntegerDivideByZero happens in line 101

I think it's code error and ask to make some safe processing for this. For example return NaN from readTemperature for this case.