Handle SnowflakeHookAsync when empty sql list is passed.

[pankajastro]

closes: #433

[codecov]

Codecov Report

Base: 98.61% // Head: 98.61% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (5daba0a) compared to base (97f0509).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #838   +/-   ##
=======================================
  Coverage   98.61%   98.61%           
=======================================
  Files          89       89           
  Lines        4970     4972    +2     
=======================================
+ Hits         4901     4903    +2     
  Misses         69       69           

Impacted Files	Coverage Δ
astronomer/providers/snowflake/hooks/snowflake.py	100.00% <100.00%> (ø)

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[park-peter]

this will conflict with #810 as it changes the way SnowflakeHook returns the result to be in line with the non-deferrable hook. Please wait until #810 is merged.