Fix norm computation for empty vectors

[mtanneau]

Addresses #105

[coveralls]

Pull Request Test Coverage Report for Build 2509

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 9 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+8.0%) to 46.797%

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Files with Coverage Reduction	New Missed Lines	%
src/extras/misc.jl	9	9.09%

Totals
Change from base Build 2508:	8.0%
Covered Lines:	1169
Relevant Lines:	2498

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💛 - Coveralls

[mtanneau]

It looks like the build on Julia nightly fails due to an LLVM error

Executing the default test script
$ export JL_PKG=DoubleFloats
Package name determined from repository url to be DoubleFloats
$ julia --color=yes -e "if VERSION < v\"0.7.0-DEV.5183\"; Pkg.clone(pwd()); Pkg.build(\"${JL_PKG}\"); else using Pkg; if VERSION >= v\"1.1.0-rc1\"; Pkg.build(verbose=true); else Pkg.build(); end; end"
    Cloning default registries into `~/.julia`
######################################################################## 100.0%
      Added registry `General` to `~/.julia/registries/General`
   Updating registry at `~/.julia/registries/General`

LLVM ERROR: Cannot emit physreg copy instruction
The command "julia --color=yes -e "if VERSION < v\"0.7.0-DEV.5183\"; Pkg.clone(pwd()); Pkg.build(\"${JL_PKG}\"); else using Pkg; if VERSION >= v\"1.1.0-rc1\"; Pkg.build(verbose=true); else Pkg.build(); end; end"" failed and exited with 1 during .

Your build has been stopped.

I don't know what this error is, and all tests pass locally (I'm using Julia 1.4).

Can the build be manually re-triggered?

[JeffreySarnoff]

It looks like the build on Julia nightly fails due to an LLVM error
Can the build be manually re-triggered?

Yes. It has been re-triggered.

[codecov-io]

Codecov Report

Merging #106 into master will increase coverage by 9.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   38.84%   47.93%   +9.08%     
==========================================
  Files          62       62              
  Lines        2505     3069     +564     
==========================================
+ Hits          973     1471     +498     
- Misses       1532     1598      +66     

Impacted Files	Coverage Δ
src/math/linearalgebra/support.jl	100.00% <100.00%> (+13.33%)	⬆️
src/DoubleFloats.jl	50.00% <0.00%> (-50.00%)	⬇️
src/math/ops/op_dbfp_db.jl	50.00% <0.00%> (-16.67%)	⬇️
src/math/ops/op_fpdb_db.jl	33.33% <0.00%> (-12.83%)	⬇️
src/math/arithmetic/modpi.jl	38.57% <0.00%> (-8.80%)	⬇️
src/math/prearith/floorceiltrunc.jl	52.77% <0.00%> (-5.69%)	⬇️
src/extras/misc.jl	7.89% <0.00%> (-3.22%)	⬇️
src/math/arithmetic/normalize_hypot.jl	75.00% <0.00%> (-1.93%)	⬇️
src/extras/random.jl	10.29% <0.00%> (-1.78%)	⬇️
src/math/linearalgebra/matrixfunction.jl	17.39% <0.00%> (-1.66%)	⬇️
... and 42 more

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